The Best Cleanup Crew for a Vivarium

The short version

• A vivarium cleanup crew is a few dollars of insects that replace a weekly cleaning: springtails eat mold, isopods break down waste and leaf litter.
• Seed the crew two to four weeks before your animal, so it is established and feeding before there is waste to process.
• The default crew for a dart frog is tropical springtails (Collembola sp.) plus dwarf white isopods (Trichorhina tomentosa); a gecko viv with more waste can take faster powder isopods.
• Below: each species, the temperature it wants, and how to match the crew to your build.

A full vivarium cleanup crew costs a few dollars and replaces a chore. A single scoop of springtails and a starter culture of isopods, seeded two to four weeks before your animal, break down the mold, waste, and dead leaves that would otherwise have you scrubbing the tank every week. The crew does not clean the glass or top off the water, but it handles the one job that makes bioactive setups worth building: it turns waste back into plant food before it fouls the tank.

There is no single best crew, only the right crew for your animal and your substrate. A tiny dart frog wants a different set than a gecko that produces more waste, and a deep soil layer wants a worker the surface crew cannot reach. Here is each option and where it fits.

What a cleanup crew actually does

A cleanup crew is the detritivore layer of a bioactive tank: animals that eat decaying matter and animal waste and never touch the living plants or your pet. Springtails work the surface and the mold; isopods work the leaf litter and heavier waste; worms work the soil below. Together they close the loop, converting what falls to the floor into nutrients the plants take back up.

The crew is not a filter, and it is not instant. It needs 2 to 4 weeks to establish a breeding population before an animal arrives, and it needs food (leaf litter, mostly) to keep going. Build it in first, feed it, and it self-sustains for the life of the tank.

Springtails: the foundation

Springtails are the first thing to add to any bioactive vivarium, weeks before anything else. They are near-microscopic insects that eat mold and decaying matter and, as a bonus, become live food for small animals.

• **Tropical springtails (Collembola sp.)**, 68 to 82 F and 70 to 100 percent humidity, eat the mold that blooms on new wood and multiply into the millions in a warm, damp tank. A single culture seeds a whole viv from one scoop, and dart frogs and small geckos pick them off as they surface.
• Temperate springtails (Folsomia candida), 60 to 78 F, are the white springtail sold in most cultures. They breed faster, culture easily on charcoal, and tolerate a cooler room, which suits a temperate terrarium better than the tropical type.

Either one is the base of the food web. Without springtails, mold takes over a new build within a week or two, so they go in first every time.

Isopods: the waste processors

Isopods are the workhorses that break down leaf litter and animal waste. Which one you want depends on how much waste your animal makes and how big the tank is.

• Dwarf white isopods (Trichorhina tomentosa), 70 to 82 F, are the standard dart-frog crew: tiny, blind, and they stay in the substrate breaking down waste and leaf litter without ever bothering plants. They are safe as frog food, which is why they pair with springtails in almost every frog viv.
• Powder orange and powder blue isopods (Porcellionides pruinosus), 68 to 82 F and 60 to 90 percent humidity, are fast-breeding and fast-moving, clearing waste quicker than dwarf whites. They suit a heavier bioload like a gecko viv, though they are active on the surface, so larger animals may hunt them.
• Dairy cow isopods (Porcellio laevis), 68 to 82 F, are large and extremely fast-breeding, built for a big or heavy-waste enclosure. They need a protein source (a bit of fish food) or, underfed, they may nibble soft plants and even other isopods. They are overkill for a nano viv.

For most first builds, dwarf whites or powder isopods are the right call. Save the dairy cows for a large enclosure with real waste to process.

Earthworms: the underground layer

The surface crew cannot reach waste that settles deep in a thick substrate. In a deep vivarium or a paludarium, earthworms (Lumbricus or Eisenia), 55 to 80 F and 70 to 100 percent humidity, aerate the soil and process the detritus below the surface. They are the underground half of a cleanup crew, and composting worms (Eisenia) work best in the shallower layers.

Worms are optional in a shallow tank, where the isopods reach everything. They earn their place once the substrate is more than a few inches deep, which is common in a planted paludarium.

How to match the crew to your build

Pick the crew from the animal and the substrate, not the other way around:

• Dart frog viv: tropical springtails plus dwarf white isopods. Small, substrate-bound, and safe as food at 72 to 80 F.
• Gecko viv (more waste): springtails plus powder orange or powder blue isopods, which clear a heavier load faster.
• Large or heavy-waste enclosure: dairy cow isopods, fed a protein source so they do not turn on your plants.
• Cooler room (under 70 F): temperate springtails, which tolerate 60 to 78 F better than the tropical type.
• Deep substrate or paludarium: add earthworms below the isopod layer to work the soil.

Every crew wants leaf litter as its standing food supply, so lay a full cover of magnolia, oak, or almond leaves and refresh it as it breaks down.

The honest part: what goes wrong

The most common failure is starving the crew. A cleanup crew is a colony of living animals, not a product, and it dies out if there is no leaf litter or food between an animal's waste. A bare tank with a clean floor and no litter is a tank where the crew quietly disappears, and then the mold and waste come back.

The second failure is a crew that does not match the tank. Powder isopods in a dart frog viv get eaten off the surface before they establish; dairy cow isopods in a nano tank, underfed, start on your plants. And any crew dries out and dies if the humidity drops out of its band, so hold 70 percent or more for the tropical species. Match the crew, feed it, and keep it damp, and it runs for years.

Frequently asked questions

How long before the cleanup crew is established?

Give it two to four weeks before adding your animal. In that window the springtails and isopods breed up a working population and start processing leaf litter, so there is a crew in place before there is waste. You will know springtails are established when they scatter across the glass as you mist.

Do I need both springtails and isopods?

For a full crew, yes. Springtails handle mold and fine surface matter, while isopods break down leaf litter and heavier animal waste, so together they cover the whole job at 68 to 82 F. You can start with springtails alone in a plant-only terrarium, but any tank with an animal wants both.

Will the cleanup crew hurt my plants or my animal?

No, with one caveat. Springtails, dwarf whites, and powder isopods eat only decaying matter and never touch healthy plants or your pet. Dairy cow isopods (Porcellio laevis) are the exception: underfed, they may nibble soft plants, so keep a protein source in the tank if you use them.

How do I feed a cleanup crew?

Leaf litter is the standing food supply: a full cover of magnolia, oak, or almond leaves feeds the crew for weeks and gives isopods cover to breed. Supplement with a pinch of fish food or a slice of vegetable now and then, especially for a fast crew like dairy cows. In a tank with an animal, the animal's waste feeds a good part of the colony on its own.

Where to go next

The crew is one leg of a bioactive build; the substrate and plants are the other two, and they have to fit together. Pair your crew with the best plants for a vivarium and read how to set up a bioactive vivarium for the full layer stack the crew lives in, or the vivarium drainage layer guide if you are still building the false bottom. To match a specific crew to the animal you want to keep, and the 68 to 82 F it lives at, run it through the build planner or check each species in the compatibility database.