Isopod Care: A Beginner's Guide to Isopod Keeping

Isopod keeping is one of the most rewarding and low-fuss corners of the pet hobby. To get started you really only need four things right: a ventilated container, a deep moisture-retentive substrate of soil, leaf litter and rotting wood, stable warmth and humidity (most species are happy around 20–25°C and 70–80% humidity), and a varied detritivore diet. Get the substrate right and the rest genuinely is easy. This guide walks a complete beginner through choosing a species, setting up the enclosure, day-to-day care, feeding and breeding.

In my last blog I shared how my own early mistakes caused trouble in my colonies. So this is the guide I wish I'd had at the start — a beginner's perspective on keeping isopods well.

Isopods (commonly called woodlice or pill bugs) are small land crustaceans, and as detritivores they break down decaying matter, which makes them brilliant in a terrarium or bioactive setup. Personally, I keep my colonies simply as pets, which I find every bit as fulfilling as any other way of keeping them. The vast majority of pet isopods belong to the terrestrial suborder Oniscidea.

I asked my community for the one pro tip they'd give any beginner. A few favourites:

• "Stock up on tonnes of leaf litter."
• "Get the substrate right and the rest is easy."
• "Get one species and then cancel the internet."
• "Make room for more tubs. Once you have some you're bound to want more."
• "Don't overthink it — they're really not that hard to care for. Avoid bright light, don't get them wet, and never feed them after midnight!"

The consensus: keep it simple, and be prepared to get pleasantly addicted to these little crustaceans.

Choosing Your Isopod Species

There are thousands of isopod species, and some are far more beginner-friendly than others. Picking the right one for your experience level is the single best thing you can do for an easy start. Our guide on how to choose the right isopod species goes deeper, but here are reliable starting points:

• Porcellio laevis (including Dairy Cow): hardy, adaptable and fast-breeding, available in white, grey, orange and patterned forms. Forgiving of beginner mistakes.
• Armadillidium vulgare: the classic pill woodlouse that rolls into a tight ball. Resilient, undemanding and a great clean-up crew member.
• Porcellio scaber (rough woodlouse): a widespread, tough detritivore with attractive morphs like Dalmatian and Orange Koi. Unlike Armadillidium, it can't roll into a ball.
• Dwarf white isopods (Trichorhina tomentosa): tiny, prolific and self-cloning, perfect for small enclosures and as a vivarium clean-up crew.
• Cubaris murina: a gentle introduction to the more exotic Cubaris genus — a little more demanding than the species above, but rewarding.

A practical note on space: larger, hungrier species such as the giant canyon isopod (Porcellio sp.) or big Porcellio and Armadillidium maculatum need bigger enclosures and produce more waste, and the giants can turn cannibalistic if underfed. If you fancy keeping more than one species in a single enclosure, read up on whether you can keep different isopods together first, as compatibility varies. Whatever you choose, check that species' specific needs before you buy.

Setting Up the Habitat

A good enclosure is the foundation of easy isopod keeping — nail this and most other problems never arise.

The Container

Plastic tubs (Really Useful Boxes are a hobby favourite) or glass terrariums both work well. The essentials are a secure lid to prevent escapes and good ventilation: a few holes on more than one side prevent stale, stagnant air. You want airflow without letting the enclosure dry out completely.

Substrate and Leaf Litter

The substrate is the heart of the setup. A mix of organic, pesticide-free soil, sphagnum moss and leaf litter works beautifully:

• Organic soil holds moisture and provides nutrients (make sure it's free of fertilisers and pesticides).
• Sphagnum moss helps hold humidity and gives beneficial microfauna a foothold.
• Leaf litter is both food and shelter as it breaks down — use leaves from safe trees like oak, beech or maple.
• Rotting hardwood and cork bark add hides and slow-release food.

Aim for a depth of around 8–10 cm (3–4 inches) so they can burrow, and remember that burrowing species like Cubaris want considerably deeper. Add bark or cork pieces on top for extra hiding places.

Day-to-Day Care

Moisture and Humidity

Isopods need humidity, but the most common beginner killer is overdoing it — waterlogged substrate breeds mould and harms the colony. Aim for moist, not wet. A reliable approach:

• Mist lightly every few days, adjusting to your home's conditions, rather than soaking the substrate.
• Keep one end of the enclosure damper than the other so the isopods can choose their preferred spot — a moisture gradient is far better than uniform dampness.
• Use a hygrometer if you want certainty; most species are happy around 70–80%. Our humidity guide for isopods covers fine-tuning.

Cleaning and Maintenance

One of the joys of isopods is how little cleaning they need — they largely clean up after themselves. Just remove uneaten fresh food within a day or two before it moulds, glance over the enclosure now and then for excessive mould or waste, and refresh part of the substrate every few months, always mixing in some of the old material to preserve the established microfauna.

Temperature

Most isopods do well between about 18°C and 24°C, and many are perfectly happy at normal room temperature provided humidity and food are right. Keep them out of direct sunlight and away from radiators, and avoid sharp temperature swings. If your home runs cold, our guide to isopod heating requirements explains when and how to add gentle warmth safely.

Lighting

No special lighting is needed. A normal day-night cycle from ambient room light is plenty — just avoid bright light that creates hotspots or overheats the enclosure.

Feeding Your Isopods

Feeding is refreshingly simple, since isopods are scavengers, but variety keeps a colony healthy. If you'd like the full picture, see our guide on what isopods eat.

• Leaf litter and rotting wood form the dietary foundation — always keep some available.
• Vegetables like courgette, carrot and cucumber make good supplements; chop or grate them small to limit mould. (I grate everything I give my colonies.)
• Protein — dried shrimp, fish food or a dedicated isopod food — is important, especially for larger species and for breeding. Offer it sparingly.
• Calcium from cuttlebone or limestone supports healthy moulting and should always be available.
• Avoid citrus, which can harm them.

Feed every few days, watching how much actually gets eaten so you can judge the right amount, and clear away excess before it attracts fungus gnats (harmless, but a nuisance).

Understanding Their Behaviour

Half the pleasure of keeping isopods is watching them. Most are primarily nocturnal, but with good humidity and plenty of hides you'll often see them out in daylight too. They're sociable, clustering together under bark and in leaf litter — partly for company, partly to conserve moisture. They're also positively thigmotactic, meaning they like their bodies in contact with surfaces, which is why they wedge into crevices and burrow so readily. Give them a deep substrate and plenty of cover, and you'll see their natural behaviour at its best.

Breeding and Colony Care

If your conditions are right, breeding usually takes care of itself — a healthy, well-fed colony at stable humidity and warmth will reproduce on its own. A few things to know:

• Maturity takes time — many species need several months to reach breeding age.
• Reproduction is by direct development: females carry fertilised eggs in a fluid-filled brood pouch (the marsupium) on their underside until tiny, fully formed young called mancae emerge. There's no larval stage.
• Sexing is possible in some species by size or by the males' longer, more slender rear appendages, though it takes a practised eye.
• Population will rise to match available food and space; if a tub gets crowded, simply move some to a new enclosure (or pass them on to another keeper).

A Final Tip: Add Springtails

One of the best things a new keeper can do is add springtails (Collembola) to the enclosure. These tiny arthropods are the perfect companions for isopods: they speed up the breakdown of organic matter and help keep mould in check, they thrive in the same humid conditions, and they add another living layer to your mini ecosystem. Just add a small starter culture once your enclosure is set up; they breed quickly and quietly get on with the job.

And that's really all there is to it. Set up a good enclosure, keep things moist but not wet, feed a varied diet, and let your colony settle in. Embrace the learning curve, chat with fellow keepers, and don't be surprised when one tub becomes several. Happy keeping!

By Kezia Hopkinson