How to Breed Dwarf White Isopods: The Complete Microfauna Playbook

I've seeded more bioactive vivariums than I can count, and dwarf white isopods (Trichorhina tomentosa) are the one piece of microfauna I tell every dart frog and small-amphibian keeper to start culturing the day they set up a tank. They're tiny — about 3–4mm, blind, ghost-white — and they're the most forgiving, explosive, useful little cleanup animal in the hobby if you understand one thing: they are the opposite of a "powder" isopod. Where powder blues and powder oranges want airflow and a drier-leaning gradient, dwarf whites want warm, wet, and stuffy. Get that backwards and the culture crashes; get it right and you'll never buy microfauna again.

This is the complete playbook: the biology that actually changes how you keep them, the warm/moist/low-ventilation setup that makes a culture explode, what to feed, how they fit into a bioactive vivarium, how to harvest without crashing the colony, and a troubleshooting section for when a culture stalls or dies back. Read it once, build the culture properly, and it'll quietly feed your frogs and clean your tanks for years.

What dwarf white isopods actually are

Dwarf whites are a small tropical isopod — a terrestrial crustacean, not an insect — native to Central and South America, where they live in the warm, humid leaf litter and topsoil of the forest floor. Adults top out around 3–4mm (you'll see sources say "up to 5mm," but in practice most of the animals you'll ever see are smaller, and the working size is tiny). They're soft-bodied, pale to translucent white because they lack the pigment other isopods carry, and they're effectively blind — they navigate by touch and chemical cues, not sight, which is why they live their whole lives under cover and bolt from light.

That ghost-white, eyeless, sub-surface lifestyle is the care sheet. Everything below is just a way of recreating a patch of warm, wet, dark, rotting forest floor inside a small plastic tub.

Two biological facts make this species unlike almost anything else you'll keep:

• ◆They're parthenogenetic. Every individual is functionally female and reproduces without a male — a process called parthenogenesis. There are no males to find, no ratio to balance, no pairing to manage. Every single animal in the tub is a breeder. This is the entire reason a dwarf white culture compounds so fast and so reliably: you're not waiting on a fraction of the population to reproduce, you're waiting on all of it.
• ◆They're direct-developing live-bearers. Like all isopods, females carry their developing young in a fluid-filled brood pouch on the underside of the body called a marsupium. The young emerge as fully formed miniature isopods (called mancae), not larvae and not eggs exposed to the air. You never lose a clutch to a dried-out egg case the way you can with crickets — the young are protected internally until they're ready to walk.

Why dwarf whites are the workhorse microfauna

Three traits make dwarf whites the cleanup animal I steer beginners and serious vivarium keepers toward alike:

• ◆They breed explosively and parthenogenetically. A small starter culture, kept warm and wet, becomes a substrate visibly crawling with whites in a couple of months. Because every animal breeds, the ramp is faster than almost any "normal" isopod.
• ◆They're the gold-standard dart frog cleanup crew. They're small enough to thread through the deepest leaf litter and topsoil, they relentlessly process frass and mold and decaying matter, and the smallest of them are the right size to be eaten by tiny dart frog froglets. For poison dart frog vivariums specifically, this is the microfauna isopod.
• ◆They're almost impossible to see and impossible to be a nuisance. They live under the substrate, avoid light, don't climb out into your living space in any meaningful way, don't smell, and don't touch live plants. They're pure background utility.

The honest trade-off: they're too small to be a real feeder for most reptiles. If you're keeping a bearded dragon or a leopard gecko, dwarf whites are not your feeder colony — they're microfauna for a planted enclosure at best. Their value is as a cleanup crew and as food for the smallest amphibians and inverts, not as a staple feeder you breed for bulk.

Dwarf whites vs. powder isopods: get this right first

Before anything else, internalize the single most important distinction in isopod keeping, because it's where most crashed cultures come from. Tropical isopods like dwarf whites and "powder"-type isopods (powder blue, powder orange — both Porcellionides pruinosus and relatives) want opposite environments.

If you take one thing from this guide: dwarf whites want it warm, wet, and low-airflow. Powder isopods want it more ventilated and drier-leaning. Build a dwarf white culture like a powder culture and it dries out and stalls. Build a powder culture like a dwarf white culture and it molds and crashes. They are not interchangeable setups even though they're both "isopods."

If you're keeping the drier, more ventilated powder species too, I've written a dedicated companion guide on raising healthy powder blue isopods — start there for that species and use this one for the tropical whites.

The culture container: a full build

Size and shape

Dwarf whites don't need much room to start. A shoebox-sized plastic tub (roughly 6 quarts) is plenty for a starter culture and will produce more microfauna than most single vivariums can consume. Scale up to a 12–16 quart bin only when you're feeding multiple tanks or running a froglet operation. Squat and wide beats tall and narrow — these are sub-surface animals, so floor area matters more than height.

I use opaque or translucent plastic tubs, not glass. Dwarf whites want dark, plastic is cheap and light and holds humidity beautifully, and a snap-lid tub is exactly the low-ventilation, high-humidity box this species wants. Glass works if you want to watch them, but you rarely will — they're under the substrate almost all the time.

Ventilation: deliberately minimal

Here is where dwarf whites break every rule you've heard about isopods. They want low ventilation. Where a powder isopod culture needs generous airflow, a dwarf white culture wants to stay humid and stuffy so the substrate never dries.

In practice: a snap-lid tub with a few small holes — or even no holes at all if you open the lid to check on them every few days for a quick air exchange — is correct. Some keepers run dwarf whites in completely sealed deli cups and just crack them weekly. If you do add ventilation, keep it minimal: a small patch of fine mesh hot-glued over a couple of dime-sized holes is plenty. The goal is a humid, stable box, not a breezy one.

The one thing to watch with low ventilation is stagnation and mold on the surface, which is why food management (below) matters. But the fix for a dwarf white culture is almost never "add more airflow" — it's "remove the rotting food and don't over-wet it."

Substrate: the engine of the culture

The substrate isn't just where dwarf whites live — it's most of what they eat, and it's where reproduction happens. Build it well and the culture half-runs itself.

A proven mix:

• ◆Coconut fiber (coco coir) as the base. Cheap, holds moisture superbly, chemically inert, and the default for a reason. Dwarf whites breed explosively in plain moist coco fiber alone.
• ◆Leaf litter on top and mixed in. Dried, decomposed hardwood leaves — oak, magnolia, and beech are the classics — are both food and shelter. This is the closest thing to their wild diet and a litter-rich culture always outproduces a bare one. Use leaves collected from pesticide-free areas or bought clean.
• ◆A few pieces of rotting hardwood / cork bark. Soft, decaying untreated wood feeds the microbial biofilm they graze and gives them cover. Cork bark flats laid on the surface become condos you can lift to find clusters of animals.
• ◆A calcium source. Crushed eggshell, cuttlebone, or a pinch of crushed limestone/oyster shell. Isopods are crustaceans — they need calcium to molt and rebuild their exoskeletons. Keep a source available at all times.

Run the substrate 2–3 inches deep. Deep enough to hold moisture and let them work through it, not so deep it goes anaerobic and sour. Keep it damp throughout, like a wrung-out sponge — not a single dry layer, but no standing water either.

A small but real tip: seed the culture with a pinch of springtails. They'll ride along in the same moisture, attack any mold before it gets established, and don't compete meaningfully with the isopods. A dwarf white culture with a springtail population is more stable than one without.

Heat and moisture: the part that decides everything

If you take a second thing from this guide, take this. Dwarf whites survive across a range and explode only when it's warm and wet. Most "my culture isn't doing anything" problems are simply too cold, too dry, or both.

Temperature

Target 72–82°F (22–28°C) for strong reproduction. Dwarf whites are a warm tropical species and tolerate the warm end better than most isopods — they'll happily breed in the upper 70s to low 80s where some species sulk. Below about 72°F they slow noticeably; down in the 60s reproduction nearly stops, though the animals survive.

A few rules:

• ◆Room temperature is often enough. In a heated home, a culture sitting on a shelf in the low-to-mid 70s will produce fine. You don't always need supplemental heat.
• ◆If you do heat, heat gently and from the side or under one end. A low-wattage heat mat under one corner of the tub, ideally on a thermostat, creates a warm zone without cooking the whole culture. Never bake the entire box — these are small, soft animals with little water reserve and they overheat fast.
• ◆Avoid direct sun and hot windows. A sunny windowsill will cook a small tub to lethal temperatures in an afternoon. Keep cultures out of direct light entirely (they're blind and photophobic anyway).

Moisture and humidity

This is the make-or-break for dwarf whites specifically. They need a consistently very moist environment — roughly 80%+ humidity inside the box — because they breathe through gill-like pleopodal structures that must stay damp, and at their size they dehydrate fast.

• ◆Keep the substrate damp throughout. Mist with dechlorinated or aged water as needed to keep it like a wrung-out sponge. With low ventilation you'll mist far less often than you'd expect — sometimes once a week or less.
• ◆Leave one small corner slightly drier so the animals can self-regulate, but the bulk of a dwarf white culture should stay wet. This is the opposite of how you'd run a powder isopod culture, where the dry side is large and important.
• ◆Don't waterlog it. "Very moist" is not "swampy." Standing water at the bottom and a sour, anaerobic substrate will kill a culture as surely as drought. Damp, not flooded.
• ◆A drying-out culture is the #1 killer. Because the box is small and the animals are tiny, a culture that's allowed to dry even once can collapse. If you're going to err, err slightly wet — but the real target is steady, even dampness.

Before you change anything else about a sluggish culture, press a finger into the substrate and check the moisture, then check the temperature. Nine times out of ten it's drier or colder than you assumed.

Feeding dwarf white isopods

Most of what dwarf whites eat is the substrate itself — the coco fiber, the leaf litter, the rotting wood, and the microbial biofilm and mold growing on all of it. That's why a litter-and-wood-rich substrate is doing most of the feeding for you. But supplementing accelerates growth and reproduction dramatically.

A working menu:

• ◆Leaf litter, always available. The dietary staple. Dried, slightly decomposed hardwood leaves break down slowly and feed the culture continuously. Top it up as it disappears.
• ◆Rotting hardwood. Soft, decaying untreated wood and cork bark — both food and cover.
• ◆A protein source, in small amounts. Fish flakes, shrimp pellets, or a commercial isopod food give the protein boost that supercharges reproduction. A pinch goes a long way — protein is also what mold loves, so dose lightly and don't let it sit.
• ◆Calcium, always available. Cuttlebone, crushed eggshell, or crushed limestone for molting and exoskeleton health.
• ◆Occasional fresh produce. Tiny pieces of zucchini, carrot, cucumber, sweet potato, or squash add moisture and variety. Pesticide-free, washed, and pulled before it rots.

How often: small amounts once or twice a week is plenty for a healthy culture, scaled to how fast it disappears. The single biggest feeding mistake with dwarf whites is overfeeding protein and produce, which molds in the low-ventilation box and fouls the culture. Feed small, watch what they actually consume, and pull anything fuzzy or rotting promptly. A culture that's molding isn't usually under-ventilated — it's over-fed.

Breeding and the life cycle

This is where dwarf whites reward you for almost no effort. Because they're parthenogenetic, you don't need to do anything to "pair" them — every animal you put in the tub is a breeder. Set the environment right and reproduction is automatic.

The cycle: a mature individual carries developing young in her marsupium (brood pouch), then releases a batch of fully formed mancae — miniature whites that immediately start grazing the substrate. Under good conditions (warm, very moist, leaf litter plus protein), they mature in roughly 6–8 weeks and immediately begin producing their own young. Generations overlap continuously, so a healthy culture is a constant mix of sizes from pinhead-tiny mancae to full adults.

A few practical breeding notes:

• ◆Start with a real culture, not a handful. A starter culture of a few dozen-plus animals in established substrate ramps far faster than a tiny scoop. If you're buying in, a starter culture from a microfauna supplier like All Angles Creatures gives you live substrate and an instant breeding base rather than a few stragglers.
• ◆Then leave it alone for ~2 months. The classic mistake is harvesting too early and knocking the population back before it's established. Seed it, keep it warm and wet, feed it lightly, and don't pull anything meaningful until it's visibly crawling — usually 2–3 months in.
• ◆Warmth and moisture are the throttle. Want more, faster? Nudge the temperature toward the low 80s and keep it evenly damp. Cooler and drier slows the whole machine.
• ◆Density rarely limits them in practice — they pack into substrate at remarkable densities — but a culture that's been harvested down still needs food and moisture to rebuild, so don't strip it bare.

How dwarf whites fit a bioactive vivarium

This is the real reason most people keep them, so it's worth being concrete. In a bioactive (self-cleaning, planted) enclosure, dwarf whites are part of the cleanup crew — the microfauna that turns waste into a non-issue.

What they do inside a viv:

• ◆Break down frass, shed skin, dead plant matter, and uneaten food before it can rot, mold, or spike ammonia.
• ◆Graze mold and biofilm, helping keep the substrate and hardscape clean.
• ◆Aerate the topsoil and litter layer as they work through it, which benefits live plant roots.
• ◆Feed the smallest animals. In a dart frog viv, the tiniest dwarf whites are appropriately sized prey for froglets and small adult dart frogs — a self-renewing in-tank food source.

How to seed a viv:

1. ◆Springtails first. Add springtails when you set up the viv and let them establish for a couple of weeks — they're your front-line mold control.
2. ◆Dwarf whites next. Add a generous scoop of an established culture (substrate and all, so you bring the breeding base and their food) into the leaf litter once the viv has settled.
3. ◆Keep feeding the crew. A clean new viv doesn't have enough waste to sustain a big cleanup population yet, so keep leaf litter topped up and let frog waste build the food supply over time.

Because dwarf whites are small, sub-surface, and parthenogenetic, they establish quietly and self-sustain in a viv far better than larger isopods, which is exactly why they're the dart frog keeper's default. They're the same kind of quiet, set-and-forget cleanup logic I rely on with a well-run discoid roach feeder colony — build the conditions once, then let biology do the work.

Harvesting microfauna without crashing the culture

Once the culture is booming, harvesting is easy and, done right, harmless.

• ◆The cork-bark lift. Lay flat pieces of cork bark or wood on the surface. Animals cluster underneath; lift a piece and tap the clinging whites into your destination viv or container. Fast, clean, and you barely disturb the substrate.
• ◆The scoop method. For seeding a new viv, just scoop substrate-and-all from a thriving culture — you transfer animals, mancae, and their food/microbe base in one move, which establishes far better than picked-out adults.
• ◆Never strip it. Leave the bulk of the population and plenty of mancae behind. Because they're parthenogenetic and fast, a culture you've harvested a third out of will rebound in a few weeks if you keep it warm, wet, and fed.

For their actual use as food: the tiniest individuals are the right size for dart frog froglets, small mantellas, baby amphibians, and small inverts. For anything bigger than a small frog, they're too small to bother with — that's not their job.

Maintenance rhythm

• ◆Check moisture every few days; mist as needed. With low ventilation you'll mist less than you expect. Damp throughout, wrung-out-sponge feel.
• ◆Feed light, twice a week-ish. Top up leaf litter; small protein/produce; pull anything molding.
• ◆Crack the lid for air occasionally. With a low-ventilation setup, opening the box when you check it gives enough gas exchange without drying it out.
• ◆Top up substrate as it's consumed. They literally eat the coir and litter, so the level drops over time — refresh it.
• ◆Don't over-clean. Frass, biofilm, and partially broken-down litter are the food web. Spot-remove mold and rotting produce; do a real refresh only when the substrate is mostly spent (every several months), and always keep a chunk of old substrate to seed the new.
• ◆Keep a backup culture. Split a thriving culture into two tubs. If one crashes (dries out, overheats, molds badly), the other is your insurance and reseed source. This is the single best habit for never losing your microfauna.

Troubleshooting a struggling culture

Work the causes in order of likelihood:

• ◆Stopped producing / numbers crashing? Check moisture first, then temperature, then food. It dried out or got cold far more often than anything else. Re-moisten to wrung-out-sponge, warm to 75–80°F, add leaf litter and a small protein boost, and a stunned culture usually rebounds in a few weeks.
• ◆Mold blooming everywhere? Almost always too much food, not too little air. Pull the rotting food, ease off protein and produce, and let your springtails do their job. Only after that consider a touch more ventilation.
• ◆Sour, swampy smell / animals dying? Waterlogged and going anaerobic. Let it dry back toward damp (not wet), improve drainage, remove the soured top layer, and stop over-misting.
• ◆Tiny tan specks crawling on the food (not the isopods)? Grain mites, a sign it's too wet and over-fed. Reduce moisture slightly, remove wet food, and they'll subside. A healthy culture with springtails rarely gets overrun.
• ◆Slow growth in an otherwise fine culture? Usually too cool or not enough protein. Nudge temperature toward the low 80s and make sure leaf litter plus an occasional protein source are always present.
• ◆Predatory or competing pests (e.g., predatory mites, fungus gnats)? Quarantine and bake/freeze any new leaf litter or substrate before adding it, and a strong springtail population helps crowd out problems.

Starting your first culture, step by step

If you've never run a dwarf white culture, here's the exact sequence I'd follow, in order, so you set conditions before the animals arrive instead of scrambling after:

1. ◆Prep the tub. Take a clean 6-quart snap-lid plastic tub. Add minimal ventilation — a couple of small mesh-covered holes, or none, planning to crack the lid weekly. Remember: low ventilation is correct here.
2. ◆Build the substrate. Lay down 2–3 inches of moist coconut fiber. Mix in and top with a generous layer of dried hardwood leaf litter (oak/magnolia/beech), tuck in a few pieces of rotting hardwood or cork bark, and add a calcium source (cuttlebone or crushed eggshell).
3. ◆Moisten it through. Dampen with dechlorinated or aged water until the whole substrate feels like a wrung-out sponge — damp throughout, no standing water. Leave one small corner slightly drier.
4. ◆Seed springtails first (optional but recommended). A pinch of springtails now gives you mold insurance from day one.
5. ◆Add the dwarf whites. Tip in your starter culture, substrate and all. Settle the lid.
6. ◆Place it warm and dark. Somewhere stable at 72–82°F, out of direct sun. A shelf in a heated room is usually perfect; add a gentle heat mat under one corner on a thermostat only if the room runs cold.
7. ◆Then wait. Check moisture every few days and mist if it's drying; feed a little leaf litter and an occasional pinch of protein. Otherwise leave it closed and alone for ~2 months. Resist the urge to dig through it — you'll just stress a culture that's quietly exploding under the surface.

That's the whole setup. The discipline is in step 7: build it right, then leave it alone.

Water, and the small details that matter

A few easy-to-miss details separate a culture that limps along from one that thrives:

• ◆Use dechlorinated or aged water. Tap water's chlorine and chloramine are hard on tiny soft-bodied invertebrates and on the beneficial microbes in the substrate. Let tap water sit out 24 hours, use a dechlorinator, or use spring/RO water. This small habit prevents a lot of slow, mysterious die-back.
• ◆Bake or freeze wild leaf litter and wood before adding it. Forest-collected litter and wood are ideal food but can carry predatory mites, pest invertebrates, or eggs. A spell in the freezer (a few days) or a low oven bake sterilizes it without ruining its value as food. Bought, clean litter skips this step.
• ◆Watch condensation as a moisture gauge. With low ventilation, the inside of the lid tells you a lot: light, even condensation that clears when you crack the lid is about right; heavy sheeting water that never clears means it's too wet; a bone-dry lid means it's drying out and needs misting.
• ◆Don't chase a "perfect" hygrometer number. A cheap hygrometer is useful for a sanity check, but the wrung-out-sponge feel of the substrate and the condensation read are more reliable day to day than a number floating in the air space.

Dwarf whites vs. other cleanup crew: choosing your microfauna

"Isopod" and "cleanup crew" cover a lot of animals that do different jobs. Choosing the right one for your enclosure matters more than people think, and the most common mistake is picking on looks instead of on the job and the conditions. Here's how the common options actually compare:

The reads that matter for a keeper:

• ◆Dwarf whites and springtails are partners, not rivals. Springtails live in the top moisture film and are the fastest mold responders; dwarf whites work deeper and process more bulk. In a serious bioactive build you run both. Seed springtails first, add whites once the viv settles.
• ◆Dwarf whites are the only one on this list bred specifically as deep-litter microfauna for the smallest amphibians. Their tiny size is the whole point — it's why dart frog keepers default to them and why they're useless as a feeder for anything bigger than a small frog.
• ◆If you want a feeder isopod, look at the powders or the bigger species, not dwarf whites. Match the animal to the job: microfauna and froglet food → dwarf whites; cleanup that doubles as a small-animal snack → powders.
• ◆Match conditions, not just looks. A wet tropical viv suits dwarf whites; a drier or moderate enclosure suits the powders and bigger species. Putting a drier-loving isopod in a swamp (or vice versa) is the most common reason a "cleanup crew" quietly dies off.

The molting and calcium connection

It's worth understanding why the calcium source in your culture isn't optional, because it explains a lot of otherwise-mysterious culture problems. Isopods are crustaceans, and like all crustaceans they grow by molting — periodically shedding the old exoskeleton and hardening a new, larger one. That new shell is built largely from calcium, and a molting isopod is briefly soft, vulnerable, and dehydration-prone.

Two practical consequences:

• ◆Calcium-starved cultures molt poorly. Without a steady calcium source (cuttlebone, crushed eggshell, limestone, oyster shell), animals can have failed or difficult molts, slower growth, and weaker reproduction. Keep a source in the culture permanently — it's not a supplement you add occasionally, it's a fixture.
• ◆Isopods often eat their own shed exoskeletons to reclaim the calcium and minerals. This is normal and healthy — don't "clean up" sheds, they're part of the mineral cycle inside the culture. The same goes for the frass and biofilm: a dwarf white culture is a closed nutrient loop, and over-cleaning breaks it.

This is also why moisture and molting are linked. A culture that dries out doesn't just dehydrate the animals — it disrupts molting, because soft, freshly molted isopods desiccate fastest of all. Steady dampness plus steady calcium is what keeps a culture molting, growing, and breeding smoothly.

Scaling up: running a microfauna farm

If you keep multiple vivariums or breed small amphibians, one culture won't keep up. Scaling dwarf whites is simple and worth doing deliberately:

• ◆Run several small cultures, not one giant tub. Multiple shoebox tubs are easier to keep evenly moist and warm than one huge bin, and they give you redundancy — if one crashes from drying out or overheating, the others carry you and reseed it.
• ◆Stagger them. Start a new culture from a thriving one before you need it, by scooping substrate-and-animals into fresh substrate. You always want a culture in peak production while another is building.
• ◆Keep a "never touch" mother culture. Designate one culture you harvest from rarely or never, as your insurance and genetic/biological reservoir. Crop hard from the others and let the mother stay deep and stable.
• ◆Label and date them. A bit of tape with the start date tells you at a glance which cultures are mature and ready to crop and which are still establishing.

Done this way, a dwarf white operation scales smoothly from "seeds one dart frog viv" to "feeds a froglet room" without ever becoming a chore — which is exactly the appeal of a parthenogenetic, self-renewing animal.

Common myths and mistakes

A few things I see repeated that quietly cost people their cultures:

• ◆"More ventilation is always better for isopods." False for dwarf whites — they're the low-ventilation exception. This single piece of generic isopod advice, applied to dwarf whites, dries out and kills more cultures than anything else.
• ◆"They need males and females to breed." No — they're parthenogenetic. Every animal breeds. If your culture isn't producing, it's conditions (moisture, heat, food), never a sex-ratio problem.
• ◆"Mold means I need more airflow." Usually it means you over-fed. For a low-ventilation species, the first fix for mold is less food and a springtail crew, not a breezier box.
• ◆"Keep it sopping wet." Very moist, yes; waterlogged, no. A sour, anaerobic, standing-water culture kills as surely as drought. Damp like a wrung-out sponge is the target.
• ◆"They're a good feeder." Only for the very smallest animals. Don't build a dwarf white culture expecting to feed a gecko or a dragon — that's not what they're for.
• ◆"Clean the culture thoroughly and often." Over-cleaning removes the frass, biofilm, sheds, and broken-down litter that are the food web. Spot-clean problems; refresh substrate only occasionally.

A note on responsible keeping

Dwarf whites are a non-native species in most of the world, so the same rule applies as with any exotic: don't release them outdoors and keep your cultures secure. They're unlikely to establish in a cold climate, but responsible keeping means they live in your tubs and tanks, not the local ecosystem. Source from a reputable supplier with clean, healthy cultures, and if you ever buy in new stock, hold it separately for a couple of weeks to watch for mites or pests before merging it into an established culture. For background on isopod biology and terrestrial crustacean ecology, the Smithsonian National Museum of Natural History's resources on isopods and university extension entomology pages are solid non-commercial starting points.

The short version

Build a warm (72–82°F), very moist, low-ventilation tub of coco fiber plus leaf litter and rotting hardwood, keep a calcium source in it, feed leaf litter constantly and protein lightly, keep it damp throughout like a wrung-out sponge, seed in springtails alongside, and then leave it alone for two months. Because every dwarf white is a parthenogenetic breeder, that's all it takes — the culture explodes on its own and becomes a quiet, self-renewing supply of cleanup crew and tiny-amphibian food. Remember the one rule that separates a thriving culture from a dead one: dwarf whites are the wet, stuffy isopod, the mirror image of the airy, drier powder species.

Keeping the drier, more ventilated cousins too? See my guide to raising healthy powder blue isopods, or browse the full exotic animal care library for feeders, cleanup crews, and bioactive setups.