Isopods are one of the easiest and most rewarding ways into the exotic-pet hobby: they're cheap to keep, fascinating to watch, and largely look after themselves. To get started you need four things right — a ventilated enclosure with a moisture gradient, a substrate of soil, leaf litter and rotting wood, stable warmth and humidity, and a varied detritivore diet. Get those in place and the rest follows naturally. This guide walks a complete beginner through setting up, feeding, breeding and the common mistakes to avoid.
What Are Isopods?
Isopods are land-living crustaceans — more closely related to crabs and shrimp than to insects — with over 10,000 species worldwide. Often called woodlice or pill bugs (the latter for species that roll into a ball), they're detritivores that break down decaying matter, which makes them both fascinating pets and natural recyclers. Popular hardy starter species include Armadillidium vulgare and the rough woodlouse (Porcellio scaber), while striking exotics like Cubaris sp. "Rubber Ducky" show just how much variety the hobby offers.
Setting Up the Enclosure
A good enclosure mimics an isopod's natural environment, and getting it right from the start prevents most problems later.
The container: a plastic tub or glass terrarium with a secure lid and good ventilation. Air holes on more than one side keep the air fresh and prevent the stagnant, mouldy conditions that cause most beginner trouble.
The moisture gradient: this is the single most useful trick. Keep one end of the enclosure damp and the other drier, so the isopods can move to whichever suits them and regulate their own hydration. A uniform-wet enclosure is far more likely to go mouldy.
The substrate: a mix of organic, pesticide-free soil with sphagnum moss and leaf litter holds moisture and provides food. Top it with a layer of leaf litter and add rotting wood, cork bark and other hides — isopods love to tuck themselves into crevices. A calcium source such as cuttlebone or limestone should always be available for healthy moulting.
Temperature and humidity: most species are happy around 20–25°C and at moderate-to-high humidity. Many do perfectly well at normal room temperature, so check your chosen species' needs and our humidity guide for fine-tuning.
Feeding Your Isopods
Isopods are wonderfully undemanding eaters. The foundation of their diet is decaying leaf litter and rotting wood, always kept available — this is both food and shelter. Supplement with:
- Vegetables and fruit in small amounts (courgette, carrot, cucumber), chopped small to limit mould.
- Calcium from cuttlebone or crushed eggshell, important for moulting.
- Protein such as fish flakes, used sparingly — too much can attract fungus gnats and encourage mould.
Offer roughly what the colony can clear in a day or two, remove anything uneaten before it moulds, and avoid processed or already-mouldy food. Larger species eat and produce more waste, so suit bigger enclosures; tiny dwarf species are ideal for compact setups.
Breeding and Population Control
If your conditions are right, breeding usually takes care of itself. Isopods reproduce by internal fertilisation, with females carrying their eggs in a brood pouch (the marsupium) until they hatch into mancae — tiny, fully formed young. There's no larval stage; they simply grow and moult to adulthood.
A healthy, well-fed colony will steadily expand. If it gets crowded, move some individuals to a new enclosure or pass them on to other keepers. One key rule: keep a single species per enclosure to avoid competition and stress, though different colour morphs of the same species can happily live together.
Common Mistakes to Avoid
Most beginner setbacks come down to a handful of avoidable errors:
- Poor ventilation — too few air holes lets humidity stagnate, breeding mould and attracting fungus gnats. Balance airflow with moisture.
- Overfeeding — leftover food, especially protein, spoils fast. Feed modestly and clear the excess.
- Mixing species — different species compete and stress one another, so house them separately and tailor care to each.
- The wrong substrate — one that dries out too quickly or stays waterlogged causes problems; a soil, moss and leaf-litter blend holds moisture without going stagnant.
- Buying from poor sources — always choose healthy stock from a reputable seller rather than an impulse buy.
Ready to Start?
Isopods are a brilliant first step into exotic pets — simple, engaging and endlessly varied. Set up a well-ventilated enclosure with a moisture gradient and a good substrate, feed a varied diet, keep one species per tub, and let the colony settle in. For more, our full beginner's guide to isopod keeping goes deeper on every step.
Frequently Asked Questions
Are isopods easy to keep?
Yes — they're among the easiest exotic pets. With a ventilated enclosure, a good moisture gradient, leaf litter and a varied diet, they largely look after themselves and need only occasional attention.
What's the best isopod for a beginner?
Hardy, forgiving species like Armadillidium vulgare, the rough woodlouse (Porcellio scaber), Dairy Cow (Porcellio laevis) and dwarf whites are all excellent starting points.
How often should I feed my isopods?
Keep leaf litter and rotting wood available at all times, and offer supplementary vegetables or protein every few days — only as much as the colony clears in a day or two, removing the rest to prevent mould.
Can I keep different isopod species together?
It's best not to. Different species compete for food and space and can stress one another, so keep one species per enclosure. Different colour morphs of the same species, however, can be housed together.
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