Crested Gecko Feeders: Discoid Roaches, Firebrats, or Red Wigglers?
Crested gecko diet debates get heated online, and a lot of the heat comes from a simple misunderstanding: people argue about insects as if insects were the main meal. They aren't. A crested gecko (Correlophus ciliatus) thrives on a complete commercial crested gecko diet (CGD) as its foundation — the fruit-and-protein powders like Pangea and Repashy that you mix with water. Live insects are a supplement, fed once or twice a week for protein and enrichment, not the core of the diet. Hold that frame and the "which feeder" question gets a lot clearer.
So when a keeper asks me whether to use discoid roaches, firebrats, or red wigglers, I'm really being asked which supplemental bug is worth the effort. I've used and watched cresties react to all three, and the verdict isn't close.
What a crested gecko's diet is built on
In the wild on New Caledonia, crested geckos are omnivores eating soft fruit, nectar, and the occasional insect. In captivity, a balanced diet means:
- Staple CGD, offered three to four times a week, providing the bulk of calories, vitamins, and minerals.
- Live insects, once or twice a week, for protein and hunting enrichment.
- Calcium and vitamin D3, dusted on insects, to prevent metabolic bone disease.
- Hydration from regular misting; cresties lap droplets off leaves and glass.
One care note that overrides feeder choice: crested geckos are heat-sensitive. They want roughly 72–78°F and can be harmed by sustained temperatures much above the low 80s — the opposite of a desert reptile. That matters here because two of our three candidate feeders prefer it hot, which makes them awkward to keep alongside a cool-running gecko. (For the full habitat picture, see the exotic animal care hub.)
Discoid roaches: the one I actually recommend
Discoid roaches (Blaberus discoidalis) are the standout supplemental feeder for cresties, and it's not particularly close:
- Soft body, easy digestion. Their low-chitin exoskeleton is gentle on a small gecko's gut and reduces impaction risk.
- Lean protein. Roughly 20–23% protein and 5–7% fat — exactly the lean protein boost a CGD-fed gecko benefits from, without piling on fat.
- Good hydration, at about 65–70% moisture.
- Easy and clean to keep. They don't climb smooth walls, don't fly, barely smell, and live a long time in a simple bin.
- Size range. From small nymphs for hatchlings to larger nymphs for adults, so you can match the feeder to the gecko.
The honest caveats: they cost more than crickets, they breed slower than dubia, and their calcium ratio — like every feeder here — is phosphorus-heavy, so you must dust them with calcium. That single habit, not any natural "balance," is what makes them safe. If you want a self-sustaining supply, my discoid roach breeding playbook covers the whole colony build; if you'd rather buy them ready to feed, All Angles Creatures stocks discoid roaches sized for cresties.
Firebrats: a niche curiosity, not a feeder
Firebrats (Thermobia domestica) are small, silver, fast-moving insects related to silverfish. People bring them up because they breed readily and are soft-bodied. In practice, I steer crestie keepers away from them:
- They thrive in heat — above 90°F — which is the opposite of what a crested gecko enclosure should be, so you're maintaining a hot culture for a cool pet.
- They're tiny and frantically fast, which makes them an escape risk and a real candidate to establish a household population if they get loose.
- Palatability is inconsistent. Some geckos chase them; many ignore or are stressed by the erratic, darting movement.
- Sourcing is a hassle — they're a specialty feeder you'll rarely find stocked.
Firebrats can be an occasional micro-feeder for very small reptiles, but for crested geckos they don't justify the effort or the infestation risk.
Red wigglers: the worm geckos love to reject
Red wigglers (Eisenia fetida) are composting worms, cheap and everywhere. On paper they're soft and protein-bearing. In a crested gecko enclosure they tend to fail for one decisive reason: defensive secretion. When disturbed, red wigglers release a bitter-tasting coelomic fluid. A lot of geckos take one mouthful, decide it's unpleasant, and refuse worms going forward.
Beyond palatability, red wigglers run lower in protein (around 10–12%) than discoids, carry a lot of water, and have an unhelpful mineral balance that needs correcting. They also prefer cool, moist conditions and can pick up contaminants if sourced from a garden or bait shop rather than a clean culture. They aren't dangerous in small amounts, but as a feeder they're a step down from discoids in nearly every way that matters.
Head-to-head
| Feeder | Protein | Keeping | Palatability | Verdict |
|---|---|---|---|---|
| Discoid roach | ~20–23% | Easy, cool-tolerant, low odor | Reliable; calm prey | Recommended staple insect |
| Firebrat | Modest | Needs >90°F; escape/pest risk | Inconsistent; can stress geckos | Skip |
| Red wiggler | ~10–12% | Cool, moist; cheap | Often refused (bitter secretion) | Skip |
How I feed insects to crested geckos
- CGD first. The commercial diet is the foundation; insects are the supplement.
- Discoids once or twice a week, sized no larger than the space between the gecko's eyes.
- Gut-load 24–48 hours ahead with greens and quality chow.
- Dust with calcium every insect feeding, with periodic D3 and multivitamin per your lighting setup, following established reptile supplementation guidance.
- Feed in the evening, when cresties are active, and pull anything uneaten in the morning.
A crested gecko feeding rhythm
Here's the weekly cadence I use, which keeps the staple diet central and insects in their supplemental role:
- CGD three to four times a week. Mix the powder fresh with water to a ketchup-like consistency, offer it in the evening, and remove it the next morning before it spoils.
- Insects once or twice a week. For most adults, a small handful of appropriately sized discoid nymphs is plenty. Juveniles and breeding females can take the higher end of that range for the extra protein.
- Calcium on every insect feeding, with a multivitamin and D3 on the schedule your UVB setup calls for.
- Misting once or twice daily to maintain 60–80% humidity and give the gecko droplets to drink.
Crested geckos are nocturnal-leaning, so feeding at dusk matches their natural activity and you'll see far better feeding responses than during the day.
Getting a reluctant crestie to take insects
Some crested geckos, especially ones raised solely on CGD, ignore insects at first. A few tricks reliably help:
- Feed at night with dim or no bright light, when the gecko is most active and confident.
- Use feeding tongs to wiggle the insect gently — movement is the trigger, and presenting it at the gecko's eye level mimics natural prey.
- Try a small feeding cup so slow-moving discoid nymphs can't hide in the substrate before the gecko notices them.
- Be patient and consistent; offer insects on the same evening each week so it becomes a routine the gecko learns to anticipate.
This is also exactly why firebrats and red wigglers struggle — firebrats are too frantic and red wigglers taste bitter, both of which work against a clean feeding response. Discoids' calm, deliberate movement is far easier for a crestie to engage with.
A note on tail loss and stress
Crested geckos drop their tails when stressed or grabbed, and unlike many geckos, a crestie's tail does not grow back. This is another quiet argument for calm feeders and gentle, low-handling routines: a frantic chase after a darting firebrat or rough handling to offer a worm can trigger a tail drop. Slow, contained discoids fed by tongs or in a dish keep feeding time low-stress for both of you.
The verdict
Of the three, only discoid roaches belong in a crested gecko's rotation. They're soft, lean, clean, cool-tolerant, and reliably eaten — everything firebrats and red wigglers aren't. Keep a complete CGD as the foundation, add calcium-dusted discoids once or twice a week for protein and enrichment, and skip the firebrats and worms entirely.
Comparing other crested gecko feeders? See discoid roaches vs. silkworms and discoid roaches vs. hornworms, or the full exotic animal care library.