Madagascar hissing cockroaches are easy to feed. In the wild, they’re ground-dwelling scavengers that eat fallen fruit, decaying plant matter, and soft vegetation on the forest floor. In captivity, a base of dry food supplemented with fresh fruits and vegetables covers all their nutritional needs.
The Best Staple Diet
A high-quality dry dog food or cat food makes an excellent everyday base for hissing cockroaches. Dry pellet food is convenient because it doesn’t spoil quickly, provides protein, and can sit in the enclosure without creating mold problems. Many keepers also use commercial roach chow, fish flakes, or dry grain cereals as alternatives. Whichever you choose, keep a small dish of dry food available at all times.
On top of that base, offer fresh produce a few times per week. Good options include oranges (sliced), banana peels, carrots, apples, grapes, sweet potatoes, and regular potato slices. Leafy greens like romaine lettuce, kale, and collard greens also work well. Variety matters here. Rotating through different fruits and vegetables ensures your colony gets a broader range of vitamins and minerals, and it mimics the diverse plant matter they’d encounter in Madagascar’s forests.
Foods to Avoid
Hissing cockroaches are remarkably unfussy eaters, and very few common foods are outright toxic to them. The bigger risks come from contamination rather than the food itself. Avoid anything that may have been sprayed with pesticides or herbicides, since roaches are insects and highly sensitive to those chemicals. Wash all produce before offering it. Skip heavily processed, salty, or greasy human foods. Onions and garlic are generally avoided by most keepers, and citrus should be offered in moderation since the acidity can bother some colonies if overfed.
Hydration Without Drowning
Hissing cockroaches need moisture, but an open water dish is dangerous. They can drown in surprisingly small amounts of standing water, and nymphs (baby roaches) are especially vulnerable. The safest approach is to use a natural sea sponge or water crystals placed in a small saucer. A wet sponge soaks up excess water and channels moisture to its surface, letting roaches drink without the risk of submersion. Make sure the sponge fits snugly in its container so tiny nymphs can’t slip underneath and get trapped.
Fresh fruits and vegetables also contribute a significant amount of hydration. A colony that gets regular produce may drink less from a dedicated water source, but you should still provide one. As a bonus, a damp sponge increases evaporation inside the enclosure, helping maintain the humidity levels (around 40% or higher) that hissing cockroaches prefer. Rinse or replace the sponge every few days to prevent bacterial buildup.
Feeding Schedule and Cleanup
Dry food can stay in the enclosure continuously. Fresh produce is different. Offer fruits and vegetables two to three times per week, and remove any uneaten portions within 24 to 48 hours. Leftover fresh food in a warm, humid enclosure is a recipe for mold, bacterial growth, and grain mites. Mites in particular are a common pest in roach colonies, and they almost always trace back to rotting food left too long.
Place fresh food in a shallow dish or on a small piece of cardboard rather than directly on the substrate. This makes cleanup faster and keeps moisture from soaking into the bedding. You’ll quickly learn how much your colony eats in a sitting. Start with a small amount and adjust upward. A colony of 20 adults will go through a couple of orange slices and a chunk of carrot in a night, while a smaller group of five or six may take a day or two.
Feeding Nymphs vs. Adults
Nymphs eat the same foods as adults, just in smaller quantities. They tend to prefer softer items like banana peels, ripe fruit, and moistened dry food. If you’re raising a mixed-age colony, including some softer options alongside harder vegetables ensures the smallest roaches can eat comfortably. Nymphs also molt frequently as they grow, and adequate protein from the dry food base supports healthy molting. A nymph that isn’t eating well may have trouble shedding its exoskeleton.
Calcium and Supplements
Some keepers lightly dust fresh produce with calcium powder (the same kind sold for reptiles) once a week. Calcium supports exoskeleton development, which matters for a species that molts multiple times before reaching adulthood. This isn’t strictly required if you’re offering a varied diet with quality dry food, but it’s cheap insurance for large or breeding colonies. Cuttlebone, the white oval sold for birds, is another easy calcium source you can leave in the enclosure for roaches to nibble as needed.