Discoid Roaches vs Other Feeders: Which Is Best for Reptiles?
I keep feeder colonies and I run a feeder store, so I get this question constantly: "Are discoid roaches actually the best feeder, or is that just hype?" The honest answer is that there's no single "best" feeder — there's a best staple, and then a handful of others that each do one job well. Discoids are one of the two or three feeders I'd genuinely build a diet around. But I'm not going to cheerlead them past where the facts go, because a few of the claims floating around online about discoids are flat wrong, and believing them can hurt your animal.
This is the head-to-head: discoid roaches against crickets, dubia, mealworms, superworms, black soldier fly larvae, hornworms, and waxworms. What each one is actually for, where discoids win, where they don't, and the one rule that matters more than your choice of feeder.
What a discoid roach actually is
The discoid roach (Blaberus discoidalis) is a tropical roach from Central and South America. Adults run about two inches, with a flat, oval, glossy tan-to-brown body and a soft, low-chitin exoskeleton that's easy for reptiles to digest. They're live-bearers — females carry the egg case internally and give birth to live nymphs — so you never lose a clutch to a dried-out ootheca the way you can with crickets.
A couple of corrections up front, because the internet gets these wrong constantly:
- Climbing: Adults can't scale smooth vertical surfaces like glass or smooth plastic, which is the big containment advantage. But they can grip rough surfaces — cardboard, screen, mesh — and the pinhead-sized nymphs walk straight through coarse vents. So "can't climb" is half-true and not a reason to skip escape-proofing.
- Wings: Males have functional wings and can glide short distances; they don't sustain real flight, but "discoids lack wings" is simply false. Females have shorter wings and don't fly.
- Calcium: This is the big one. You'll read that discoids have a favorable calcium-to-phosphorus ratio. They do not. Like nearly every feeder insect, discoids are phosphorus-heavy with a poor Ca:P ratio. Calcium dusting is mandatory. Anyone telling you otherwise is going to give your bearded dragon metabolic bone disease.
With that straight, here's the nutrition.
The nutrition table
These are approximate, as-fed figures. Real numbers swing with diet, life stage, and source — but the relationships between feeders are reliable, and the relationships are what should drive your choices.
| Feeder | Protein | Fat | Moisture | Chitin / Ca:P | Best role |
|---|---|---|---|---|---|
| Discoid roach | ~20% | Moderate (~6–7%) | ~60–65% | Low chitin; poor Ca:P (dust) | Staple |
| Dubia roach | ~20–23% | Moderate (~7–9%) | ~60–65% | Low chitin; poor Ca:P (dust) | Staple |
| Cricket | ~18–20% | Low–moderate (~5–6%) | ~70% | Higher chitin; poor Ca:P (dust) | Staple / variety |
| Mealworm | ~18–19% | High (~13%) | ~60% | Hard chitin shell; poor Ca:P | Treat |
| Superworm | ~18% | High (~15%) | ~60% | Hard head capsule; poor Ca:P | Treat |
| Black soldier fly larvae | ~17–18% | Moderate (~9–14%) | ~60–65% | Soft; favorable Ca:P | Calcium booster / variety |
| Hornworm | Low (~9%) | Low (~3%) | Very high (~85%) | Very soft; poor Ca:P | Hydration treat |
| Waxworm | ~14% | Very high (~20%+) | ~60% | Soft; poor Ca:P | Occasional treat |
The pattern jumps out fast: the two staple roaches sit in the sweet spot — solid protein, moderate fat, soft bodies. The worms split into "too fatty to be a staple" (mealworm, superworm, waxworm) and "special purpose" (hornworm for water, BSFL for calcium). Crickets hover right at the edge of staple territory. Let me go feeder by feeder.
Discoid vs. dubia
This is the comparison everyone actually wants, so I'll be blunt: nutritionally they're a tie. Both are soft, low-chitin, ~20% protein, moderate fat. Neither adult climbs smooth walls. Both are quiet and nearly odorless. If you put gut-loaded specimens of each in front of your animal, there's no meaningful health difference.
The decision comes down to three things:
- Breeding speed — dubia win. Dubia mature and reproduce faster, so a dubia colony ramps to harvestable numbers sooner. If raw colony output is your priority, dubia have the edge.
- Legality — discoids win. Dubia are restricted in Florida (the state regulates non-native species that could establish if they escaped into its subtropical climate). Discoids are the accepted feeder there. If you're in Florida or another dubia-restricted area, the choice is made for you, and you give up very little.
- Size — roughly even, with discoids often running a touch larger as adults.
My rule of thumb: in dubia-legal areas, pick on price and availability — either is excellent. In dubia-restricted areas, discoids are the obvious staple. I dig into this fully in discoid roaches vs dubia, but that's the short version.
Discoid vs. crickets
Crickets are the default feeder most people start with, and they have exactly one real advantage: they're cheap and available everywhere, right now, in any size. For a brand-new keeper feeding one animal, that's not nothing.
But crickets are genuinely annoying to live with. They chirp loudly, they smell, they die constantly (you'll lose a chunk of every order within days), and they're escape artists — a few always make it out of the enclosure and into your walls. They also bite, and a cricket left in overnight will gnaw on a sleeping gecko. Nutritionally they're slightly leaner and a bit higher in chitin than roaches, so they're a fine staple but not a superior one.
Verdict: crickets are a perfectly acceptable staple if you don't mind the noise, smell, and constant die-off, or if you just need a few feeders without keeping a colony. But the entire reason roaches took over the hobby is that they fix every one of those headaches. If you're feeding regularly, discoids are the upgrade.
Discoid vs. mealworms & superworms
I'm grouping these because the verdict is the same: treats, not staples. Both are beetle larvae, easy to store, cheap, and convenient — but they're fatty (mealworms ~13%, superworms ~15%) and wrapped in a hard chitin shell. Fed as a main diet, that fat drives obesity and fatty-liver issues, and the chitin is hard on smaller or juvenile reptiles' digestion.
Superworms are bigger and wrigglier (more enticing to a picky eater) but also fattier. Mealworms are small enough for juveniles but the hard shell is a real impaction concern for little animals. Both have the same poor calcium ratio as everything else, so dusting doesn't save them from the fat problem.
Verdict: great as an occasional treat or a way to tempt a reluctant feeder, useless as a staple. Discoids beat them outright for everyday feeding. If you want the deeper bearded-dragon-specific breakdown, that's a comparison worth its own guide — superworms are the single most over-fed "staple" I see.
Discoid vs. black soldier fly larvae (BSFL)
BSFL — sold as Calci-worms, Phoenix worms, or NutriGrubs — are the one genuine exception to the feeder calcium problem. They're naturally high in calcium with a favorable Ca:P ratio, which no other common feeder can claim. That makes them a fantastic rotation item, especially for animals prone to calcium deficiency.
The catch: they're small, they pupate quickly into flies if not used, and they're not really a complete staple on their own — they're a calcium booster you rotate in. They don't replace a roach colony; they complement one.
Verdict: not a discoid competitor so much as a discoid teammate. Run discoids as your staple and BSFL as your built-in calcium supplement. It's a great pairing.
Discoid vs. hornworms & waxworms
Both of these are special-purpose treats, for opposite reasons.
Hornworms are basically water with legs — ~85% moisture, ~9% protein, very low fat. That makes them excellent for hydration, for animals recovering from illness, or for tempting a dehydrated reptile to eat. But you can't build a diet on 9% protein. They're a hydration treat, full stop.
Waxworms are the opposite extreme: ~20%+ fat, soft, sweet, and basically candy. Reptiles love them, which is exactly the danger — they're easy to over-feed and lead to obesity and refusal of healthier food. Use them as a rare reward or to fatten up an underweight animal, never as routine.
Verdict: both lose to discoids as a staple by a mile, because neither is trying to be a staple. Keep them in the toolbox for their specific jobs.
The honest bottom line
Discoid roaches are an excellent staple feeder — soft, well-balanced, quiet, long-lived, and legal where dubia aren't. If I had to name the best single staple for a Florida keeper, it's discoids. For everyone else, discoids and dubia are interchangeable, and crickets are the budget option you'll outgrow.
But "best staple" isn't the same as "best diet," and this is the part the roach-cheerleading skips: no single feeder is complete. The healthiest setup is a staple roach (discoid or dubia) plus rotated variety — hornworms for hydration, BSFL for calcium, the occasional superworm or waxworm as a treat — with calcium dusting on nearly everything and proper UVB lighting for the animals that need it. The dusting and UVB matter more for preventing metabolic bone disease than which insect you pick. Get those two right and discoids make a near-perfect foundation to build the rest of the rotation around.
If you want to start a colony or just feed off a healthy batch, All Angles Creatures stocks well-started discoid roaches sized for both breeding and direct feeding — it's my own store, so I keep the stock clean and the sizes honest.
Going deeper on discoids? See discoid roaches vs dubia for the full roach-on-roach breakdown, or why discoids are perfect for reptile diets for the case for making them your staple.