The short version: a cleanup crew is the team of tiny detritivores that live in the substrate of a bioactive enclosure and quietly eat the mess. Animal waste, shed skin, uneaten food, mould, dead leaves: the crew works through it before it piles up, so the tank starts behaving like a small ecosystem instead of a box you have to scrub. The two staples are isopods and springtails. Get them established with moist substrate, leaf litter, and a few hides, give them a few weeks, and you spot-clean far less than you would in a bare setup.
What does a cleanup crew actually do?
Think of the crew as the recycling shift that never clocks out. In a bioactive tank, organic material is constantly arriving: a stool from your animal, a piece of shed, a cricket leg that never got eaten, a plant leaf that yellowed and dropped. In a sterile enclosure all of that sits there until you remove it. In a bioactive one, the crew breaks it down and folds it back into the soil as castings that feed the live plants.
The result you notice first is odour. A working crew keeps waste from sitting and souring, so a healthy bioactive tank smells like damp soil and leaf litter rather than a dirty cage. The second thing you notice is how rarely you reach in with tweezers. The crew is not magic, and it does not make a large stool vanish overnight, but it handles the steady drizzle of small organic matter that would otherwise be your daily chore.
There is a quieter benefit too. A substrate full of isopods and springtails is alive in a way that suits the animals on top of it. Many keepers find their reptiles and amphibians forage in the litter, hunting the odd isopod, which is a little bonus enrichment built right into the floor of the tank.
Isopods vs springtails: who does what?
These two are the standard pairing because they work at different scales and rarely step on each other.
Isopods are the heavy lifters. They are small land crustaceans, the same group people call roly-polies or pill bugs, and they go after the bigger debris: leaf litter, decaying wood, animal waste, shed skin, and leftover feeders. They rasp away at cork bark and rotting leaves and turn coarse material into smaller pieces and droppings that enrich the soil. There are dozens of species and colour morphs in the hobby, from hardy Porcellio and Armadillidium to flashier dwarf types, so you can match a crew to your enclosure's size and moisture.
Springtails work at the microscopic end. They are tiny, soft, six-legged invertebrates, usually under a couple of millimetres, and they graze on mould, fungi, algae, and biofilm: the fuzzy stuff that appears when fresh organic matter starts to soften. When a new tank throws a mould bloom on a piece of wood, a springtail population will often clear it within a day or two. They also help keep the humidity-loving microfauna in balance and snack on things like fungus gnat larvae.
So isopods clean what you can see and springtails clean what you usually cannot. Run both and you cover the whole range, from a fallen leaf down to the film on a damp rock. Some keepers add other helpers over time, such as certain mites or small beetles, but for almost every setup the isopod-and-springtail duo is all you need to start.
How do I get a crew started?
A cleanup crew needs a place to live before it can do any work, so you build the habitat first and add the animals second.
Start with a deep, moisture-holding substrate, usually a few inches of a soil, coco fibre, and sphagnum mix. Cover the surface with leaf litter, which is both food and shelter and gives the beneficial fungi and bacteria somewhere to take hold. Add cork bark or a couple of hides, since isopods love to gather and breed in the damp space underneath. Keep the substrate evenly moist, not soaking. A tank that holds steady humidity beats one that swings from wet to bone dry.
Then add the crew and wait. Springtails go in first, then isopods, and most keepers give them roughly two to four weeks to settle, breed, and spread through the substrate before introducing the reptile or amphibian. During that window you can drop in a little extra food, a bit of dried leaf or a pinch of fish flake, to help the colony build numbers. Match the crew to the enclosure as well: humidity-loving springtails and tropical isopods thrive in a damp frog or gecko tank, while drier, sturdier isopod species suit an arid setup.
Is a bioactive setup really self-cleaning?
Mostly, but not entirely, and it is worth being honest about that. Bioactive is low-maintenance, not no-maintenance. The crew handles the steady stream of small organic matter, yet it will not keep up with everything. A big stool from a large lizard, a drowned feeder, or anything in the water dish is still yours to remove. You will also keep an eye on humidity and airflow, because the same moisture that keeps the crew happy can turn into stagnant, mouldy soil if the tank never breathes.
Some animals suit a bioactive build better than others. A species that produces a lot of high-moisture or high-odour waste can simply out-produce a small crew, and very large or very arid setups take more planning. None of this is a reason to skip it. It just means the goal is a healthy living system you tend lightly, not a tank you can ignore. Done well, a bioactive enclosure shifts your job from constant scrubbing to occasional checking, and the animal gets a richer, more natural floor to live on.
Frequently asked questions
Do I need both isopods and springtails, or just one?
You can run either alone, but together they cover far more ground. Isopods break down the larger waste, shed, and leaf litter, while springtails clear the mould and microscopic film that isopods leave behind. Most keepers start with both because each one handles a job the other is not built for.
How long before the cleanup crew starts working?
Give the crew roughly two to four weeks to settle into the substrate, start breeding, and spread out before you count on it. Springtails often show visible results on mould within a day or two, while isopods take longer to build a population large enough to keep pace with daily waste.
Will a cleanup crew harm my reptile or amphibian?
No. Isopods and springtails are harmless detritivores that feed on waste and decaying matter, not on healthy animals. Many reptiles and amphibians even forage for the occasional isopod, which adds a bit of natural enrichment. Just keep the crew well fed so it stays focused on the substrate.
Does a bioactive tank mean I never have to clean?
Not quite. A cleanup crew greatly cuts down on routine spot-cleaning, but it is low-maintenance rather than no-maintenance. You will still remove large waste, manage the water dish, and keep humidity and airflow in a healthy range so the soil stays alive instead of going stagnant.
If you keep isopods, springtails, and the other small creatures that make a tank tick, you can wear them too. Our Inverts & Arachnids collection is full of detailed designs celebrating the underrated crew, including this Isopod Roll With tee for anyone who has ever cheered on a roly-poly doing the quiet work in the substrate.