Do Isopods Eat Springtails?

It's a question that comes up constantly among keepers building their first bioactive enclosure: if I add isopods and springtails to the same setup, will the isopods eat the springtails? It's a sensible thing to wonder — you're putting two different animals in one box, and nobody wants to spend money on a springtail culture only to watch it become an isopod snack.

The short answer is reassuring: no, isopods don't eat springtails. The two coexist peacefully, occupy slightly different niches, and actually complement each other beautifully as a cleanup team. This guide explains why the myth exists, what's actually going on in a shared enclosure, and how to keep both thriving together.

The short answer: they coexist, they don't compete

Isopods and springtails are both detritivores — animals that feed on decaying organic matter, mould, and waste rather than on each other. Neither is a predator. An isopod is built to graze on rotting leaves, wood, mould and the occasional bit of protein; it has no interest in, and isn't equipped to hunt, a fast, springing animal a fraction of its size. Springtails, for their part, get on with grazing mould and fine detritus and spring away instantly from any disturbance.

So in a shared enclosure, the two simply do their own thing. They're not competing for the same food in any meaningful way, they're not preying on one another, and they're not in conflict. They're the classic bioactive pairing precisely because they work together without friction — which is why nearly every experienced isopod keeper runs springtails alongside their colonies as a matter of course.

Why the myth persists

If isopods don't eat springtails, why do so many keepers worry that they do? A few understandable reasons.

Springtail populations do fluctuate. A springtail culture has natural booms and dips depending on moisture, food and conditions. A keeper who adds springtails, then later notices fewer of them, can understandably (but wrongly) conclude the isopods ate them — when in reality the springtails dipped for some other reason, or simply settled deeper into the substrate out of sight.

Springtails are easy to lose sight of. They're tiny and they hide. A population that's gone quiet or moved down into the substrate can look like it's "gone," prompting the assumption that something ate it. Usually it's still there, just not visible on the surface.

Both animals scavenge anything dead. Here's the kernel of truth behind the myth: isopods (and springtails) are scavengers, so if a springtail dies of natural causes, an isopod won't turn its nose up at the remains — that's just detritivores doing their job, cleaning up dead organic matter. But scavenging a dead springtail is completely different from hunting and killing a live one. The isopod isn't a predator; it's a cleanup crew member tidying up. This is almost certainly where the "isopods eat springtails" idea comes from, and it's a misreading of normal scavenging behaviour.

Conditions can favour one over the other. If an enclosure is, say, too dry for springtails but fine for isopods, the springtail population may struggle while the isopods thrive — making it look as though the isopods "won." In truth it's the conditions, not predation, doing it.

How they actually help each other

Far from being in competition, isopods and springtails make each other's job easier, which is the whole reason they're the foundation of bioactive keeping.

They clean at different scales. Isopods are the larger crew, processing leaf litter, rotting wood, larger waste and chunks of decaying matter. Springtails work at a finer scale, getting into the small stuff and grazing mould across surfaces the isopods don't cover. Between them they handle the full range of cleanup a healthy enclosure needs.

Springtails keep mould off everything — including the isopods' food. A springtail population grazing down mould benefits the whole enclosure, keeping the isopods' environment and food sources cleaner.

They cycle nutrients together. Both break organic matter down into the bioactive cycle, enriching the substrate, supporting live plants, and maintaining the self-sustaining balance that makes a bioactive setup work with minimal intervention. Our guide to how isopods play a crucial role in soil health explains that nutrient-cycling side in more depth.

This is exactly why, when you read about building a bioactive enclosure, springtails and isopods are recommended together rather than as alternatives.

Keeping both thriving in one enclosure

If the two get on so well, why do springtail populations sometimes struggle alongside isopods? Almost always it's conditions, not conflict. Here's how to keep both booming.

Get the moisture right. Springtails need consistent dampness more than isopods do, and the most common reason a springtail population fades in a shared enclosure is that it's too dry for them. Keep at least part of the enclosure reliably moist and both will thrive.

Provide plenty of food and substrate. A deep, nutritious substrate of leaf litter and decaying wood feeds both animals and gives the springtails somewhere to live and breed, well away from the isopods. Abundance removes any hint of competition.

Don't over-rely on a tiny starter population. Add a good, healthy springtail culture rather than a token few, so the population can establish itself and ride out the natural dips. A well-seeded culture quickly becomes self-sustaining.

Keep calcium and hides available. As with any mixed enclosure, plenty of cork bark, leaf litter and rotting wood gives everyone space, and keeps the whole system balanced.

For the full picture of running mixed enclosures — including pairing isopods and springtails with millipedes — see our guide to keeping millipedes and isopods together, and if you're setting up an isopod enclosure from scratch, our complete beginner's guide to keeping isopods in the UK covers the foundations. If your isopod colony itself ever takes a dip, our colony-crash troubleshooting guide will help you diagnose it.

The short version

Isopods don't eat springtails. Both are detritivores, not predators, and they coexist peacefully in a shared enclosure — cleaning at different scales, keeping mould down, and cycling nutrients together as the classic bioactive cleanup team. The myth comes from misreading natural scavenging (an isopod tidying up a springtail that died of natural causes) and from springtail populations dipping for reasons of moisture or conditions rather than predation. Keep the enclosure damp enough, well-fed and well-seeded, and both will thrive together indefinitely.

To build your cleanup crew, browse our springtails collection and our isopod range, pick up substrate and leaf litter from our accessories, and ask our live chat if you'd like help putting a balanced enclosure together.