Springtail Types and Their Best Uses: A Keeper's Complete Guide

I have seeded springtails into every bioactive enclosure I have built for the better part of a decade, and they are the single most useful animal you will never really look at. They live in the bottom inch of the substrate, eat the mold and rot and shed skin that would otherwise foul the tank, throw off a free supply of tiny live food, and ask for almost nothing in return. The problem is that "springtail" gets sold as if it were one thing. It is not. The hobby trades several distinct cultured types, and picking the right one for the job is the difference between a culture that explodes and carries your whole vivarium, and one that quietly stalls in a corner.

This guide is built around that one decision: which springtail type, for which use. I will cover the cultured types you can actually buy — temperate white, tropical white and tropical pink, and the giant orange types — and match each to its best role: bioactive cleanup crew, dart-frog and small-herp feeder, mold control during a tank's break-in, and self-sustaining microfauna in humidity-dependent setups. Then I will get into the real biology that makes them work, how to culture and harvest them, how to seed an enclosure so the population actually establishes, and how to fix the handful of things that go wrong. Read it once, pick your type, and you will spend the next few years barely thinking about your cleanup crew.

What a springtail actually is (and why it matters for picking a type)

Springtails are tiny arthropods in the class Collembola — wingless, six-legged hexapods that sit right alongside insects on the tree of life but are classified separately because of a few anatomical quirks. They are ancient and absurdly successful: more than 9,000 described species, found from tropical rainforest leaf litter to Antarctic snowfields, and present in nearly any patch of healthy damp soil in numbers that run into the tens of thousands per square meter. Most of what you will keep measures 0.5 to 3 millimeters, with the whole class spanning roughly 0.25 to 6 millimeters. (For a solid non-commercial primer on Collembola biology and ecology, the University of Florida's Featured Creatures entry on springtails is a good place to start.)

The name comes from the furcula, a forked, tail-like appendage folded under the abdomen and held cocked like a spring. When the animal is disturbed, it releases the furcula against the ground and catapults itself several body lengths into the air. That little jump is the thing people notice first and misread as "fleas." It is purely an escape reflex — springtails do not bite, do not have piercing mouthparts, and have no interest in you or your animals.

A few biological facts directly shape which type you should keep:

• ◆They breathe and drink through their skin. Springtails lack the waxy, waterproof cuticle that lets insects hold moisture, and most exchange gas directly through a permeable surface (some have simple internal tube structures, but they are nothing like a beetle's). This is why moisture is the master variable for every springtail you will ever keep. It is also why "temperate vs. tropical" types differ mostly in how warm and how wet they want that moisture to be.
• ◆They are decomposers, not predators of your plants. Their diet is decaying plant matter, fungi, fungal spores, bacteria, and algae. They graze biofilm and mold off surfaces. They do not eat living roots or leaves, which is why they are safe in a planted vivarium and useless as a garden "pest."
• ◆They reproduce fast and parthenogenetically in some species. The standard temperate culture species, Folsomia candida, reproduces without males — every individual is effectively a breeding female. That is a large part of why temperate whites colonize a culture so explosively and why they are the beginner default. Folsomia candida is so reliable in this respect that it is a standardized model organism in soil-toxicity testing worldwide (see the OECD test guideline 232 built around it).

Keep those three facts in your head — permeable skin, decomposer diet, fast reproduction — and every care recommendation below will read as obvious rather than arbitrary.

The springtail body plan, briefly

You do not need taxonomy to keep springtails, but a quick orientation helps you tell a healthy culture from a crashing one and helps you recognize the type you bought. Springtails have a soft, segmented body that is either elongated (cylindrical, longer than wide) or globular (round, almost spherical, like a tiny hopping water droplet). They carry a pair of antennae, six legs, and — on most — that furcula underneath. Many are coated in fine hairs or scales that make them water-repellent, which is why a healthy culture's springtails will float and skitter on a water surface rather than drown instantly. Colors run from the bright white of the standard culture species through grays and pinks to vivid blues, purples, and oranges depending on species. The cultured "types" you buy track loosely onto body shape and color, which I will get into next.

The cultured springtail types keepers actually buy

Here is the part the source articles gloss over. Scientifically, Collembola split into a few big groups — the elongated Poduromorpha and Entomobryomorpha, the round-bodied Symphypleona (which includes the brightly colored, occasionally crop-nibbling Sminthuridae), and the tiny Neelipleona. That classification is real and worth knowing, but it is not what you are choosing between when you buy a culture. What the hobby actually sells is a handful of trade types, named by appearance and culture behavior rather than always by tidy species names:

• ◆Temperate white springtails — the standard cleanup crew, very often the species Folsomia candida.
• ◆Tropical white springtails — a warm-running white type for tropical vivariums.
• ◆Tropical pink springtails — a faintly pink-tinged warm type, popular for dart-frog tanks.
• ◆Giant orange springtails — a larger, visible, orange type prized as a feeder you can actually see and target.

Two honesty notes before the table. First, these are trade and culture names, and the exact species behind them is not always settled or consistent between sellers — "tropical pink" from one source may not be the same animal as "tropical pink" from another. I will name a species only where it is genuinely standard (the temperate white = Folsomia candida) and stay general everywhere else rather than invent a binomial. Second, the behavioral differences below — temperature tolerance, size, visibility, speed — are reliable and reproducible regardless of the underlying taxonomy, and those behaviors are what you actually buy on.

Type-by-use comparison

How I actually choose between them:

• ◆If you are new, or the tank runs at room temperature, buy temperate white. Folsomia candida is the most forgiving culture in the hobby. It breeds parthenogenetically, tolerates a wide moisture band, handles cool snaps that would stall a tropical type, and rebounds fast from a hard harvest. It is the springtail I seed by default and the one I tell every first-timer to start with.
• ◆If the tank runs warm and wet — a true tropical vivarium — buy a tropical type. Tropical white or tropical pink springtails are adapted to the high 70s and low 80s with near-constant high humidity, which is exactly the climate inside a dart-frog tank or a tropical gecko viv. A temperate culture will survive in there but a tropical type will out-reproduce it and stay denser in the heat. Pink versus white is largely cosmetic and source-dependent; pick whichever your supplier keeps healthy.
• ◆If you want a springtail you can see and target-feed, buy giant orange. At 3–6 mm they are several times the size of the standard white and bright enough to spot on dark substrate, which makes them genuinely useful as a deliberate feeder rather than just ambient grazing food. They are slower to build a culture than temperate whites, so I keep them as a secondary culture, not my primary cleanup crew.

The rest of this guide treats those four types as your menu and keeps pointing back to which one fits each job.

Best use #1: the bioactive cleanup crew

This is the job springtails were born for and the reason most keepers buy them. A bioactive enclosure is one with a living substrate — a drainage layer, a soil mix, leaf litter, live plants, and a "cleanup crew" of microfauna that processes waste in place so you almost never have to do a full substrate change. Springtails are half of the classic cleanup crew (isopods are the other half), and in many setups they are the more important half because they work at a scale isopods can't.

What springtails actually do in a bioactive tank:

• ◆They eat mold and fungal blooms on the substrate, on hardscape, and especially on fresh wood and decaying leaf litter. More on this under mold control below — it is their standout trick.
• ◆They process the small stuff: shed reptile and amphibian skin, fallen feeder bits, frog and gecko waste films, dead plant matter, and the bacterial and fungal layers that grow on all of it.
• ◆They live in and aerate the top inch of soil, fragmenting organic matter into pieces that bacteria and fungi can finish, which is the front end of real nutrient cycling — the same process that, in a planted tank, quietly feeds your plants.
• ◆They are a population, not a tool you use up. Seed them once and a healthy culture self-sustains in the substrate indefinitely, scaling its numbers to the available food (the "bio-load") without any intervention from you.

Best type for general cleanup: temperate white in a room-temperature or temperate setup; tropical white or pink if the tank runs genuinely warm and humid. The deciding factor is always the tank's climate, because a cleanup crew that won't breed in your conditions isn't a cleanup crew, it's a one-time sprinkle of food.

A real-world note on density: springtails are self-regulating, so you cannot meaningfully "overdose" a tank with too many. They breed up to what the enclosure can feed and no further. That means the right move is to seed generously — a full starter culture or two into a 10–20 gallon tank — and let them find their own ceiling. A sparse seeding in a big tank can take months to fill in or get outcompeted before it establishes.

How springtails and isopods split the work

People constantly ask whether they need both. In a bioactive vivarium, the honest answer is that they do different jobs and the combination is better than either alone:

• ◆Springtails handle the micro-scale: mold, biofilm, mites' worth of organic film, the surface of decaying matter, and the deep-substrate fungal grazing. They get into spaces isopods can't and they reproduce fast enough to respond to a mold bloom within days.
• ◆Isopods handle the macro-scale: larger chunks of decaying wood and leaf litter, bigger waste, and they churn the substrate more aggressively. They are also a more substantial feeder for larger animals.

I run both in basically every tank. If you want to read up on the isopod side of the crew, my guides to dwarf white isopods and blue powder isopods cover which isopod to pair with your springtails for which setup. The short version: dwarf whites are the springtail's closest analog — tiny, prolific, substrate-dwelling — and the two together make the most reliable starter cleanup crew there is.

Best use #2: live food for dart frogs and small herps

The second great use of springtails is as micro-feeders, and for some animals they are not optional — they are the only food small enough to work.

A newly morphed dart frog, a mantella froglet, a baby of many small gecko species, or a tank of fish fry has a mouth measured in fractions of a millimeter. Fruit flies are too big for the smallest of them in the first weeks. Springtails at 0.5 to 3 millimeters drop straight into that gap. The standard practice in dart-frog keeping is to have a springtail culture established in the vivarium substrate before the frogs go in, so that froglets can graze springtails continuously — micro-grazing around the clock instead of waiting for a feeding. A self-sustaining in-tank population means there is always something tiny and alive to eat, which is exactly what a developing froglet needs.

Springtails are also a perfect dusting vehicle and enrichment feeder for slightly larger animals — small frogs and toads, juvenile geckos, and similar — where they round out a diet built on fruit flies and small crickets and give the animal natural foraging behavior.

Best type for feeding depends on the animal and how you feed:

• ◆For in-tank micro-grazing (dart frogs, fish fry, tiny froglets): tropical white or pink, seeded into the vivarium. They are sized right, they breed in the warm wet conditions those animals need, and they sustain a standing population the animals graze down without crashing.
• ◆For target-feeding you can actually watch: giant orange. Because they are large and brightly visible, you can tap a portion onto a feeding ledge or leaf and watch the animal hunt them. This is the type to reach for when you want to see that your animal is eating, or when the animal is big enough that tiny whites aren't worth the effort.

A clean way to serve springtails as a deliberate feeder is the float-and-pour method: tap the culture so springtails come to the surface, add a splash of dechlorinated water to float a raft of them, and pour that water — springtails and all — into the enclosure. The animals snap them up off the surface. It is the same trick as the water-trap harvest below, used as a feeding method.

If you are setting up your first culture for feeding and want healthy, well-started stock rather than a wild-collected gamble, All Angles Creatures carries springtail starter cultures sized for both seeding a vivarium and feeding off directly.

Best use #3: mold control during a tank's break-in

Anyone who has built a planted vivarium knows the break-in bloom: in the first two to six weeks, fresh hardscape wood, new leaf litter, and rich substrate sprout white fuzzy mold as the wood's sugars and the substrate's organics get colonized by fungi. It looks alarming. It is mostly harmless and temporary — but it is unsightly, and on a heavy bloom it can foul a small tank.

Springtails are the best biological answer to that bloom. They graze fungal hyphae and the mold films directly, and because they reproduce fast, a seeded population responds to a bloom by multiplying on the food source until the bloom is suppressed. I seed springtails into every new build specifically to ride out the break-in period, and tanks with an established springtail population bloom far less and clear far faster than tanks without.

Two honest limits, because the source material oversells this and I won't:

• ◆Springtails control mold, they do not eliminate it. They eat specific fungi, algae, and decaying matter, not literally every mold species, and they can't outpace a bloom driven by genuinely bad conditions. A tank that is sealed, stagnant, and waterlogged will mold faster than any springtail population can graze. Springtails are a powerful part of mold management, alongside adequate ventilation, sensible moisture (damp, not swampy), and not burying uneaten food. Get those right and the springtails finish the job.
• ◆A mold bloom is partly the springtails' food, so a little is fine. You actually want some fungal activity early — it is what feeds the culture up to the density that then keeps the tank clean long term. The goal is a managed bloom that the population eats through, not a sterile tank.

Best type for mold control: whichever cleanup type matches your tank's climate — temperate white for cooler builds, tropical white or pink for warm humid ones. Mold-grazing is a cleanup behavior, so the same type-selection logic as use #1 applies. Density matters more than type here: a big, well-fed population is what mows down a bloom, so seed generously into a new build.

Best use #4: self-sustaining microfauna in humidity-dependent setups

The fourth use is less a separate job than a payoff of the first three: in any humidity-dependent enclosure — tropical vivariums, planted paludariums, moss terrariums, even a damp bioactive isopod tank — springtails become a permanent, self-sustaining layer of microfauna that quietly keeps the whole system stable.

Because they reproduce quickly and scale to the available food, a springtail population in a moist tank holds a stable equilibrium even under a heavy bio-load. They work in concert with the live plants, the bacteria, and the other microfauna so the enclosure becomes genuinely self-sustaining — waste gets processed in place, mold stays suppressed, and you go from "cleaning a tank" to "tending an ecosystem." This is the entire appeal of bioactive keeping, and springtails are the engine room.

The one requirement is moisture. Because springtails breathe and drink through permeable skin, a setup that dries out is a setup that loses its springtails. This is why they thrive in tropical, high-humidity vivariums and struggle in arid setups. You can keep a springtail population going in a drier enclosure, but only by maintaining a permanently damp zone — a moist corner, a section of damp sphagnum moss, a humid hide — that they retreat to and breed in. For a true desert setup, springtails are a marginal cleanup crew at best; for anything tropical or temperate-humid, they are ideal.

Best type: tropical white or pink for warm tropical setups, temperate white for cooler humid ones. Same logic, every time: match the type's climate to the enclosure.

How to culture springtails at home

Even if your main goal is an in-tank population, I strongly recommend keeping a separate dedicated culture on the side. It gives you a backup if the tank population crashes, a steady harvest for feeding, and stock to seed your next build. Culturing springtails is genuinely one of the easiest things in the hobby — cheaper and simpler than culturing fruit flies — and a single culture can run productively for many months.

Setting up a culture

You have two classic substrate approaches. I use the charcoal method for feeders and the soil method for stock I'll seed into tanks; both work.

1. ◆Container. A clear plastic container with a tight lid — a deli cup for a small culture, a shoebox-sized storage tub for a big one. Clear lets you watch the population. You want it mostly sealed to hold humidity, with only a few small ventilation holes (or just crack the lid briefly when you feed). Too much ventilation dries the culture out; too little invites stagnation and mold, so err toward sealed-but-opened-regularly.
2. ◆Substrate — pick one:
   • ◆Horticultural charcoal (lump charcoal chunks, not briquettes), filled a couple inches deep and kept wet. Charcoal is my default for feeder cultures: springtails crawl all over the black surface where you can see them clearly, it resists fouling, and harvesting by floating is dead simple.
   • ◆Coconut coir or a bioactive soil mix, kept damp. Better if your end goal is seeding tanks, because you can scoop substrate-and-springtails straight into a new build. A few charcoal chunks mixed in still help with observation.
3. ◆Moisture. Wet the substrate with dechlorinated water until it's thoroughly damp but with no deep standing water the animals can drown in (a shallow film at the very bottom of a charcoal culture is fine and acts as a humidity reservoir). Chlorine and chloramine from tap water can harm a culture, so use dechlorinated, aged, or RO water.
4. ◆Seed the starter culture. Tip your purchased starter — springtails plus their substrate — onto the surface and let them disperse. Don't feed for a day or two; let them settle.

Climate: where temperate vs. tropical bites you again

This is where the type you bought dictates the shelf you keep it on:

• ◆Temperate white (Folsomia candida): comfortable at roughly 65–75°F, which is most people's room temperature. Keep it out of direct sun and away from heat sources. This forgiving range is exactly why it's the beginner culture.
• ◆Tropical white / pink: want it warmer, roughly 75–82°F. In a cool home you may need to keep the culture near a low heat source or on a shelf in a warm room; otherwise it will limp along instead of booming.
• ◆Giant orange: generally low-to-mid 70s up to ~80°F, warm but not extreme.

Across all types, keep cultures shaded — no direct sunlight, which both overheats and dries them — and avoid temperature swings. Stable beats optimal: a culture held steady at 70°F outproduces one that swings between 62°F at night and 80°F midday.

Feeding the culture

Springtails in a culture eat what their wild cousins eat, scaled to a cup. A working rotation:

• ◆Active dry yeast — the single most popular and effective culture food. A light pinch sprinkled on the surface every few days. The springtails swarm it visibly, which also tells you the population is healthy.
• ◆Plain cooked rice, a few grains, or other starchy bits — they grow a thin fungal film the springtails then graze (you're really feeding them the mold).
• ◆Mushroom pieces, a flake of fish food, or mashed cooked vegetable in small amounts as variety.

The cardinal rule is small amounts, often. Springtails don't eat the food directly so much as they eat the fungal and bacterial growth on it, but if you pile on more than the culture can keep up with, the excess just molds over and fouls the culture. Sprinkle a little, watch it get covered with springtails and disappear, then feed again. If you see uneaten food going fuzzy and staying fuzzy, you're overfeeding — back off and add ventilation.

Maintenance rhythm

• ◆Mist or add a little dechlorinated water whenever the surface starts to look less than damp — every few days to weekly depending on your container and ventilation. Moisture is the master variable; never let a culture dry out.
• ◆Don't over-clean. Like a roach colony, a springtail culture's accumulated frass and broken-down food is part of the working ecosystem. Leave it alone.
• ◆Restart before it ages out. A culture stays productive for many months, but it's smart to start a fresh culture from your booming one every few months so you always have a young, vigorous backup. Just scoop some substrate-and-springtails into a new prepared container.

Harvesting springtails

How you harvest depends on your substrate and what you're harvesting for.

• ◆The water-float method (charcoal cultures). This is the cleanest harvest there is and the reason I culture feeders on charcoal. Pour a little dechlorinated water into the culture so it pools; the water-repellent springtails float up onto the surface in a living raft. Pour that water straight into your terrarium or feeding container — springtails come with it, substrate stays behind. For a stubborn culture, float a loose piece of charcoal on the water first; springtails climb onto it and you lift them out on the charcoal.
• ◆Scoop-and-seed (soil cultures). To seed a new bioactive tank, just scoop a few tablespoons of substrate-with-springtails and scatter it across the new substrate and leaf litter. They'll disperse and establish on their own. This is the simplest way to populate a tank and the reason I keep at least one culture on soil.
• ◆Tap-and-pour (feeding off). Tap the culture so springtails come to the surface, then tip or brush a portion into the enclosure. Good for quick feeding when you don't need the precision of a float.

Whichever method, harvest a portion, not the whole thing. Leave the bulk of the population to rebound. A healthy culture refills a moderate harvest within a week or two.

Seeding an enclosure so the population actually establishes

A surprising number of "my springtails disappeared" problems are really "my springtails never established." Getting a self-sustaining tank population going comes down to a few things:

• ◆Seed before the animals go in, when you can. Especially for dart frogs and small herps, get the springtail population established in the substrate for a few weeks first, so there's a standing population and a head start before anything starts eating them.
• ◆Seed generously. A whole starter culture (or two) into a 10–20 gallon build, not a token sprinkle. You want a founding population dense enough to breed up before the tank's other pressures whittle it down.
• ◆Give them substrate and leaf litter to live in. Springtails need the damp, organic top layer — a bioactive soil mix plus a layer of dried leaf litter is ideal. Bare or sterile substrate won't hold a population. The leaf litter is both habitat and a slow food source.
• ◆Keep a damp zone permanently. Even in a tank that has dry areas, maintain one reliably moist region — under the leaf litter, a corner of damp moss — as the springtails' breeding refuge.
• ◆Don't overstock the predators early. A tank that goes straight to a hungry adult animal can graze a young springtail population down faster than it breeds. Let the springtails build first.
• ◆Keep your backup culture running. If the tank population ever crashes — a tank dries out, an animal over-grazes it — you reseed from your side culture instead of buying again.

Sourcing springtails and what to look for

You can buy springtails or, in theory, collect them wild. I strongly favor buying a clean cultured starter, and here's the honest tradeoff.

Buy a cultured starter when you want a known, healthy, pest-free population of a specific type. Cultured starters come as springtails in a clean charcoal or coir substrate, the species/type is consistent, and you're not importing mystery hitchhikers. This is what I do for every build. Look for:

• ◆A visibly active, dense culture — springtails swarming when disturbed, not a sparse scattering.
• ◆No mold, no foul smell, no mites. A sour smell or a bloom of tiny tan grain mites means a fouled culture you don't want to introduce into a tank.
• ◆A clean, neutral substrate (charcoal or coir), not a soggy, smelly one.
• ◆The right type for your job — temperate white for general/cool, tropical white or pink for warm vivariums, giant orange for visible feeding — bought from a seller who keeps their cultures properly.

Wild collection is possible — springtails live under leaf litter, mulch, and decaying wood almost everywhere damp — but I generally avoid it for tank use. You don't know the species, you can't control the climate match, and you risk introducing mites, pest fungi, pesticide residue, or other unwanted hitchhikers into a carefully built enclosure. For a compost pile or outdoor bed, wild springtails are already there and doing their job for free; for a vivarium, start clean.

If you're choosing between sellers, prioritize the health and density of the culture over price. A cheap, half-dead starter that takes two months to limp into production is more expensive than a vigorous one that booms in three weeks.

Springtails outdoors: garden, compost, and soil health

Most of this guide is about captive use, but springtails earn their keep outdoors too, and understanding the wild role makes you a better keeper. In soil and compost, springtails are part of the decomposer crew that:

• ◆Breaks down organic matter — leaf litter, plant debris, fungi — into humus, enriching soil and freeing nutrients for plants.
• ◆Cycles nutrients by consuming organic material and excreting it in a more bioavailable form, with carbon and nitrogen in shapes plants can take up. This is real, free fertility in a healthy compost system.
• ◆Aerates the top layer as they move through it, improving structure and water infiltration at small scale.
• ◆Acts as a bioindicator. Springtails are sensitive to pollution and moisture, so a thriving population is a sign of healthy, living soil. Their sensitivity is precisely why Folsomia candida is a standardized lab organism for soil-toxicity testing.

A realistic caveat the marketing copy skips: springtails complement earthworms, they don't replace them, and as outdoor "pest controllers" their role is modest and indirect — they suppress mold and fungi and graze some tiny soil organisms, but they're not going to clear an aphid infestation. Their outdoor value is soil health and decomposition, not pest extermination.

Common myths, corrected

Springtails generate a lot of bad information, mostly from people who meet them as an unexpected swarm in a damp bathroom rather than as a deliberate cleanup crew. Worth clearing up:

• ◆"They're fleas / they bite." No. The jump comes from the furcula, an escape reflex, not parasitism. Springtails have no biting or piercing mouthparts and no interest in humans or pets. They cannot bite you.
• ◆"They mean my home is dirty." No — they mean somewhere is damp. Indoors, springtails track moisture (an overwatered houseplant, a leaky pipe, a humid basement), not dirt. Fix the moisture and they leave on their own. In a vivarium their presence is a sign of a healthy living substrate, the opposite of a problem.
• ◆"They damage plants." No. Springtails eat decaying matter, fungi, and algae, not living roots or stems. In a planted tank they help plants by cycling nutrients. (The one asterisk: a few Sminthuridae species can nibble seedlings in agriculture, but that's a niche field-crop issue, not your terrarium's Folsomia.)
• ◆"They eliminate all mold." No — they control it. They graze specific fungi and decaying matter and suppress blooms, but they don't eradicate every mold species and can't beat genuinely bad conditions. Pair them with ventilation and moisture control.
• ◆"They can't be controlled / they're a permanent infestation." Where they're unwanted (a damp room), they're controlled by fixing moisture — ventilation, repairing leaks, letting potted soil dry between waterings — not by pesticides. In a tank, they're self-regulating and never become a problem.

Troubleshooting

Work the likely causes in order, the same way you would with any culture.

• ◆Culture or tank population dwindling? Check moisture first — a drying culture is the most common cause by far. Then check food (are you feeding small amounts regularly?) and temperature (is a tropical type sitting in a too-cool room?). Re-dampen, feed lightly, and confirm the type matches the climate. Most stalled cultures rebound within a week or two once moisture and warmth are right.
• ◆Mold blooming and staying in the culture? You're overfeeding and/or under-ventilating. Reduce feeding amounts, add a little airflow (crack the lid more often), and let the springtails catch up. A healthy population eats fresh food before it can mold.
• ◆Tiny tan specks crawling in the culture (grain mites)? A sign the culture is too wet and too rich. Mites compete with springtails and can take over a fouled culture. Reduce feeding, improve ventilation, and if it's bad, start a fresh culture by floating off a clean batch of springtails into new substrate — leave the mite-laden substrate behind.
• ◆Springtails in the tank but never visible? Often fine — they live in the substrate and surface mainly when you mist or feed. To check, mist the tank or drop a pinch of yeast on the substrate at night and look in a few minutes; a healthy population swarms it. If nothing shows after several tries, the population may have crashed (usually the tank dried out or got over-grazed) — reseed from your backup culture.
• ◆Tropical type not breeding? Almost always too cold. Tropical whites and pinks want the high 70s to low 80s; a culture sitting at 68°F will survive without booming. Move it somewhere warmer or swap to temperate whites if you can't provide the heat.

The short version

Pick the type by the job and the climate, then keep it simple:

• ◆Temperate white (Folsomia candida) — the beginner default and the all-around cleanup crew. Cool-tolerant, room-temperature, breeds explosively, forgives mistakes. Start here.
• ◆Tropical white / pink — for warm, humid vivariums (dart frogs, tropical geckos). Want the high 70s to low 80s; out-reproduce temperate whites in the heat.
• ◆Giant orange — the visible feeder. Large enough to target-feed and watch, slower to culture, best kept as a secondary culture.

Across all of them: moisture is the master variable (permeable skin), feed small amounts often (they're really eating the fungal film), keep cultures shaded and stable, seed enclosures generously and early, harvest by floating on water, and keep a backup culture running so a crash is a five-minute reseed instead of a new order. Do that and your springtails become the most boring, most useful animal in the room — a quiet, self-sustaining engine that keeps mold down, waste processed, and tiny live food always on the menu.

New to bioactive microfauna? Pair your springtails with a matching isopod cleanup crew — see my guide to dwarf white isopods for beginners — or if you want to get sharper at telling springtail types apart by sight, read how to identify springtails. The full exotic animal care library has the rest of the cleanup crew and feeder guides.