Written by the team at Creature Cache, based on firsthand breeding and bioactive setup experience in Southern California. Updated 2026.
If you are building a bioactive terrarium or vivarium, isopods are one of the most important pieces of the puzzle. They break down waste, eat mold, cycle nutrients in the substrate, and keep your enclosure clean with minimal effort from you. But not every isopod is the right fit for every setup. The best choice depends on the enclosure, its humidity, and whether you want a cleanup crew you can actually see. One rule first: we do not recommend housing our isopods with geckos or other reptiles. They are display and breeding animals, not feeders, and larger inhabitants will eat them or crush the colony. The exception is very small frogs such as dart frogs, which coexist with Cubaris well.
At Creature Cache we only breed exotic species, so this guide covers the isopods we keep ourselves and have watched work in real bioactive enclosures. If you want a plain white cleanup crew that you never see, there are cheaper options elsewhere. If you want a cleanup crew that is also the most interesting thing in the tank, read on.
Quick Reference: Best Species by Setup Type
- Dart frog vivariums (very small frogs only): Rubber Ducky or Cherry Blossom (Cubaris sp.) plus Tropical Pink springtails. Humidity 70 to 90 percent.
- Planted display terrariums: Lemon Blue or Crabby (Cubaris sp.). Big, bold, and visible. Humidity 70 to 80 percent.
- Collector and display enclosures: Ember Bee or Scarlet (Ardentiella sp.), Durian Spiky (Laureola sp.). Higher ventilation, drier gradient.
- Every setup: Tropical Pink springtails as the working crew.
Rubber Ducky Isopods (Cubaris sp.)
Best for: Humid planted terrariums, dart frog vivariums, and anyone building their first bioactive setup with an exotic species.
Rubber Duckies are the most popular Cubaris in the hobby for good reason. They are hardy, they tolerate very high humidity, and the duck bill face makes them fun to spot at night. They are slow to moderate breeders, so pair them with springtails to handle the heavy lifting on mold and waste while the colony builds.
Care level: Intermediate. Humidity: 70 to 80 percent with a drier side. Temperature: 72 to 78°F. Reproduction: Slow to moderate.
Cherry Blossom Isopods (Cubaris sp.)
Best for: Dart frog vivariums and planted tanks where you want color.
Cherry Blossoms are one of the hardiest Cubaris we keep and one of the few exotic species we recommend to beginners. They settle in fast, breed reliably, and their pink and cream coloration develops as they mature. They handle the very high humidity of a frog vivarium without trouble.
Care level: Beginner to intermediate. Humidity: 70 to 80 percent. Temperature: 70 to 78°F. Reproduction: Moderate.
Lemon Blue and Crabby Isopods (Cubaris sp.)
Best for: Planted display terrariums where size and presence matter.
These are two of the largest Cubaris in the hobby, with Crabby adults reaching close to 3 cm. They are cryptic during the day and come out at night to work the leaf litter. In a large planted tank they are a real centerpiece. Both are slower breeders, so treat them as a display colony with springtails doing the daily cleanup.
Care level: Intermediate. Humidity: 70 to 80 percent with a drier side. Temperature: 72 to 78°F. Reproduction: Slow.
Ember Bee and Scarlet Isopods (Ardentiella sp.)
Best for: Display enclosures with ventilation and climbing structure. Best kept in their own enclosure or with calm, small inhabitants.
Ardentiella are the opposite of a hide-in-the-dirt cleanup crew. Ember Bees and Scarlets climb, sit in the open, and show off. They want more airflow and a drier gradient than Cubaris, so they are a better fit for a well ventilated terrarium than a sealed frog vivarium. They mature in about 5 to 7 months.
Care level: Intermediate to advanced. Humidity: Moderate with a distinct dry side. Ventilation: High. Reproduction: Moderate for a premium species.
Durian Spiky Isopods (Laureola sp.)
Best for: Collector displays. They can live in a bioactive setup but they are not a workhorse cleanup crew.
Durian Spikies are small, armored, and shy. In a bioactive tank they will process some waste, but their real job is being the rarest thing in the room. Keep them where you can find them and let springtails do the cleanup.
Always Add Springtails
No matter which isopod you choose, add a Tropical Pink springtail culture. Springtails are the fastest mold and waste processors in the enclosure and they reproduce quickly enough to keep up with an established tank. We run them in every one of our own colonies. The combination of an exotic isopod for display and springtails for daily cleanup is the setup that works.
How to Choose the Right Species for Your Setup
For dart frogs and other very small frogs: Rubber Ducky or Cherry Blossom plus a heavy springtail population. Frogs will eat some springtails, which is fine, they reproduce fast enough to sustain it.
For geckos and other reptiles: We do not recommend our isopods in these enclosures. Keep the colony in its own bin and use springtails as the in-tank cleanup crew.
For a planted display tank: Lemon Blue or Crabby if you want size, Ember Bee or Scarlet if you want color and activity and can give them airflow.
For a pure display colony: Any of the above in their own bin. Most of our customers start with one species in a dedicated enclosure, then move a portion into a bioactive tank once the colony is established.
Pair Your Cleanup Crew With the Right Substrate
Isopods need a substrate with organic matter they can eat. We use a modified ABG mix for all of our colonies: 12 quarts sphagnum moss, 6 quarts coco coir, 4 quarts orchid bark, 2 quarts charcoal, and 2 quarts worm castings. Top it with a thick layer of hardwood leaf litter, add decaying hardwood, and include cuttlebone for calcium. See our full ABG Substrate Guide for the complete recipe.
Where to Buy Bioactive Isopods
We breed exotic isopods including Durian Spiky (Laureola sp.), Ember Bee (Ardentiella sp.), Rubber Ducky, Cherry Blossom, Lemon Blue, and Crabby (Cubaris sp.), along with Tropical Pink springtail cultures, at our Southern California facility. All animals are captive bred and ship FedEx Priority Overnight with a 100% live arrival guarantee.
Browse all isopods or shop springtail cultures. Join the waitlist for 10% off your first order.
Common Questions About Bioactive Isopods
What are the best isopods for a bioactive terrarium? For planted terrariums and dart frog vivariums, Cubaris species like Rubber Ducky and Cherry Blossom. For display tanks with ventilation, Ardentiella like Ember Bee. Always pair them with springtails.
Can I keep these isopods with my gecko or other reptile? We do not recommend it. Reptiles will eat or crush an exotic colony, and these species are too valuable to use as a feeder. Very small frogs like dart frogs are the exception.
Do isopods eat waste? Yes. Isopods are detritivores that break down decaying organic matter, though exotic species work more slowly than a mass of springtails. Run both.
How long does it take for isopods to establish in a bioactive setup? Give them 4 to 8 weeks to acclimate. Cubaris species will show visible growth within a few months. Slower species like Durian Spiky take longer, which is why we recommend starting with a group of 10 or more.
How many isopods do I need? A starter group of 6 to 10 is enough to seed a 20 to 40 gallon enclosure alongside a springtail culture. Larger tanks or faster results call for a breeding group of 10 or a colony of 20.