The Complete Guide to Keeping and Breeding Isopods
Isopods are one of the most fascinating and versatile creatures in the hobby. Whether you're keeping them as pets, using them as a cleanup crew in a bioactive terrarium, or raising them as a feeder insect for reptiles and amphibians, isopods are hardy, low-maintenance, and endlessly rewarding to work with. At Thrive Ecosystems, we keep dozens of isopod species and have dialed in a care system that works consistently across the board. This guide covers everything you need to know about keeping and breeding isopods successfully.
What Are Isopods?
Isopods — commonly known as woodlice, pillbugs, or roly-polies — are small crustaceans in the order Isopoda. Despite their bug-like appearance, they're more closely related to crabs and shrimp than to insects. They breathe through gill-like structures and require some moisture to survive, which is why humidity management is such a key part of their care.
In the hobby, isopods serve several important roles. As a bioactive cleanup crew, they break down waste, dead plant matter, and uneaten food in terrariums, keeping enclosures clean and balanced. As feeder insects, they're a nutritious, soft-bodied prey item for dart frogs, small geckos, and other invertebrate-eating animals. And as pets in their own right, they come in a stunning variety of colors and patterns that make them genuinely captivating to keep and observe.
Housing Your Isopods
Isopods are adaptable and can be housed in a variety of containers, but we've found that Sterilite latch boxes work exceptionally well. They're affordable, widely available, have smooth sides that prevent escapes, and the latching lids keep humidity in while allowing you to open and close the enclosure easily. The size of the container depends on your colony size — start smaller and upgrade as the colony grows.
Substrate: A mix of coconut fiber or peat moss forms the base of a great isopod substrate. This holds moisture well without becoming waterlogged. On top of the base, we add a generous layer of leaf litter, which serves as both food and hiding cover. Leaf litter is one of the most important elements of an isopod enclosure — don't skip it.
Layout: Our standard setup dedicates about one quarter of the enclosure to sphagnum moss and the remaining three quarters to leaf litter. This creates a natural moisture gradient — the moss side stays damper, while the leaf litter side stays drier — allowing isopods to self-regulate their hydration. We place cork flats throughout the enclosure to give isopods their favorite hiding spots and resting places.
Ventilation: We add a single 1-inch insect vent to each enclosure. This provides enough airflow to prevent stagnant, overly humid conditions without drying the enclosure out too quickly. Good ventilation is key to preventing mold and bacterial overgrowth.
Feeding Your Isopods
Isopods are detritivores, meaning they naturally feed on decaying organic matter. In captivity, this translates to a varied diet that keeps them healthy and reproducing well. Our go-to foods include:
- Leaf litter — the cornerstone of their diet; oak, magnolia, and live oak leaves are all excellent choices
- Fish flakes — a high-protein supplement that isopods love
- Repashy Morning Wood — a powdered food specifically formulated for isopods and other detritivores
- Our in-house feeder insect gut-load mix — the same blend we use for all our feeder insects, available on our website
- Fresh vegetables — carrots, cucumber, potato, and squash are all accepted readily
Always remove uneaten fresh food within a day or two to prevent mold. Dry foods like fish flakes and Repashy can be left longer. A varied diet leads to faster reproduction and healthier, more colorful isopods.
Humidity and Water
Isopods need moisture to breathe and thrive, but too much humidity can cause mold, bacterial blooms, and die-offs. The key is maintaining a moisture gradient rather than keeping the entire enclosure uniformly wet.
We manage humidity through weekly mistings of the sphagnum moss section only. This keeps the moss damp and provides the moisture isopods need without saturating the entire substrate. The leaf litter side stays relatively dry, giving isopods the option to move away from moisture when they want to.
Never mist the entire enclosure to the point of saturation. If you see condensation on the walls for more than a few hours after misting, you're adding too much water. Proper ventilation combined with targeted misting is the winning formula.
Breeding Isopods
One of the best things about isopods is how readily they breed when conditions are right. Isopods reproduce sexually — despite a common misconception, they are not hermaphroditic. Males and females mate, and females carry fertilized eggs in a brood pouch (called a marsupium) on their underside until the eggs hatch. The young, called mancae, emerge looking like tiny versions of the adults and begin feeding immediately.
To maximize breeding success:
- Maintain consistent humidity with a proper moisture gradient
- Provide abundant leaf litter and hiding spots — stressed isopods don't breed well
- Feed a varied, protein-rich diet to support egg production
- Keep temperatures in the 70–80°F range for most temperate species (tropical species may prefer slightly warmer)
- Avoid disturbing the enclosure too frequently — isopods breed best when left alone
With the right setup, a small starter colony of 10–20 isopods can grow into hundreds within a few months. Patience and consistency are the keys.
Isopods in Bioactive Terrariums
One of the most popular uses for isopods is as part of a bioactive cleanup crew in reptile and amphibian enclosures. Paired with springtails, isopods break down waste, shed skin, uneaten food, and decaying plant matter — keeping the enclosure clean and reducing the need for full substrate changes.
For bioactive use, choose isopod species that match the humidity and temperature requirements of your reptile or amphibian. Tropical species like Porcellionides pruinosus (powder isopods) work well in humid setups, while temperate species like Armadillidium vulgare (common pillbugs) are better suited to drier conditions.
Quick-Reference Care Summary
- Enclosure: Sterilite latch box with smooth interior
- Substrate: Coconut fiber or peat moss base, topped with leaf litter
- Layout: 1/4 sphagnum moss, 3/4 leaf litter, cork flats throughout
- Ventilation: Single 1-inch insect vent
- Temperature: 70–80°F (species dependent)
- Humidity: Weekly misting of moss section only
- Food: Leaf litter, fish flakes, Repashy Morning Wood, fresh vegetables, feeder chow
- Breeding: Provide hides, varied diet, and stable conditions
Final Thoughts
Keeping and breeding isopods is one of the most rewarding and low-effort aspects of the hobby. Whether you're building a bioactive setup, raising feeders, or just enjoying these fascinating little crustaceans for their own sake, isopods are a fantastic addition to any collection. At Thrive Ecosystems, we're passionate about isopods and always happy to help fellow keepers get their colonies thriving.
Browse our store for isopods, leaf litter, substrate supplies, and our in-house feeder chow — everything you need to get started.
**Disclosure: This post contains affiliate links. We may receive commissions for purchases made through links in this post, but these are all products we personally use and highly recommend.**