Isopods Care Guide: Bioactive Cleanup Crews and Pets

TL;DR: Isopods are terrestrial crustaceans that play a vital cleanup role in bioactive terrariums by breaking down waste; popular species range from beginner-friendly Porcellio scaber (50–70% humidity, 65–75°F) to premium Cubaris 'Rubber Ducky' (70–80% humidity, 72–80°F). For bioactive enclosures, start with 25–50 isopods per 10 gallons; for a standalone colony, a 6-quart tub handles 20–30 individuals. They also provide calcium-rich supplemental nutrition for reptiles that consume them.

Isopods -- also called pill bugs, roly-polies, or woodlice -- have surged in popularity in the reptile and invertebrate hobby over the past decade. They serve a critical ecological role in bioactive terrariums (breaking down waste and recycling nutrients), and many species are now kept purely as pets in their own right thanks to their fascinating behaviors and remarkable color morphs.

This guide covers popular species, basic care requirements, and how to use isopods effectively in bioactive setups.

What Are Isopods?

Isopods are terrestrial crustaceans (more closely related to crabs and shrimp than to insects). They breathe through gill-like structures and require sufficient moisture to survive. Most species also secrete calcium-rich protective shells -- making them nutritional supplements for reptiles that consume them.

Popular Pet Isopod Species

Housing Isopods

Most isopod species can be housed in simple setups:

For pet colonies:

• Plastic storage container with ventilation holes drilled in the lid
• Small Exo Terra terrarium for display setups
• Size: A 6-quart tub handles a small colony of 20-30 isopods; larger for breeding colonies

For bioactive cleanup crews:

• Added directly to the terrarium of your reptile, frog, or invertebrate
• Numbers: 25-50 isopods to start per 10 gallons of enclosure

Substrate

Isopods need a moisture-retentive, bioactive substrate:

• Organic topsoil + coco fiber mix (70/30)
• Add dried leaf litter (magnolia, oak) -- primary food source and hiding material
• Sphagnum moss in one corner for a moisture gradient
• Cork bark or wood chunks for hiding

Depth: 3-4 inches minimum for burrowing species.

Humidity

Different species have different humidity preferences (see table above). Generally:

• Maintain a moisture gradient -- one side damp, one side dry
• Mist one side 1-2 times per week
• Do NOT soak the entire substrate -- stagnant moisture causes bacterial blooms and isopod die-offs
• Leaf litter holds moisture while providing hiding and food

Temperature

Most common pet isopod species thrive at 65-80 degrees F -- typical room temperature. Species like Cubaris "Rubber Ducky" prefer the warmer end (72-80 degrees F). Avoid temperatures above 85 degrees F.

Feeding Isopods

Isopods are detrivores -- they eat decaying organic matter:

Staple foods:

• Dried leaf litter -- the single most important food; always have available
• Rotten wood/cork bark -- break down naturally over months
• Isopod food supplement -- commercial powders with protein, calcium, and plant matter

Occasional foods:

• Dried fish flakes or reptile calcium supplement -- important calcium source for shell building
• Blanched vegetables (carrot, zucchini, squash)
• Cuttle bone as a free-choice calcium source -- leave a piece in the enclosure

Using Isopods in Bioactive Setups

Isopods are the backbone of bioactive terrarium cleanup crews. They:

• Consume animal waste (feces, shed skin, uneaten food)
• Break down leaf litter and organic matter
• Aerate the substrate
• Prevent harmful bacterial and mold blooms

Best isopods for bioactive cleanup:

• Porcellionides pruinosus "Powder Orange" or "Powder Blue" -- fast-breeding, excellent cleanup
• Porcellio scaber -- robust, active, tolerant of a range of conditions
• Armadillidium vulgare -- slower breeding but very hardy

Pair isopods with springtails for a complete microfauna cleanup crew -- springtails handle mold and fungal control while isopods handle larger waste.

Isopods as Display Pets

Many keepers maintain isopod colonies purely for the joy of watching them. Premium species like Rubber Ducky isopods, Zebra isopods (Armadillidium maculatum), and Cubaris sp. from Thailand are actively collected and bred. Some rare morphs and localities command significant prices.

For dedicated isopod display setups, a heavily planted terrarium with deep substrate, varied food offerings, and proper humidity creates a thriving, fascinating micro-ecosystem.

Common Issues

• Die-off: Usually from too much moisture (stagnant water) or overfeeding causing rot. Maintain the dry-to-damp gradient and remove uneaten food.
• Escape: Isopods are surprisingly good at finding gaps. Ensure container lid is secure.
• Low reproduction: Usually from inadequate food variety or wrong temperature. Add more leaf litter and calcium.

See our rubber ducky isopod care guide for species-specific care on one of the hobby's most popular premium species. And check out our guide to lizard owner mistakes for bioactive setup pitfalls.