Some people want a pet they can enjoy without spending half an hour on it every day. Fair enough. Invertebrates can work well for this. But "low maintenance" gets thrown around a lot in this hobby, and it's worth being honest about what it actually means. No living animal is zero maintenance. What you can find are species that need attention twice a week rather than twice a day.
What "low maintenance" really means
A low-maintenance invertebrate is one where, once the enclosure is properly set up, ongoing care is minimal. You're checking conditions, topping up food and water, and occasionally replacing substrate. You're not feeding live prey daily, not monitoring precise temperature swings, and not cleaning out the enclosure every few days.
The catch is that "properly set up" is doing a lot of work in that sentence. A badly set up enclosure creates constant problems no matter how easy the species is. Get the setup right and the maintenance drops dramatically.
The top picks
Isopods (Porcellio scaber and Armadillidium vulgare)
These are the gold standard for low-effort keeping. A colony in a well-set-up tub needs checking twice a week. Spray the damp end if it's drying out, make sure there's leaf litter and a calcium source available, toss in a vegetable scrap or a bit of fish flake occasionally. That's it.
They breed on their own. They process their own waste. They eat their environment (leaf litter, decaying matter). A healthy colony is essentially self-sustaining as long as you maintain moisture and calcium. The main risk is forgetting about them entirely, which leads to the enclosure drying out and the colony quietly dying.
Porcellio scaber comes in colour morphs (Dalmatian, orange, calico) so you get visual interest without extra care complexity. Armadillidium vulgare is slightly hardier in drier conditions and can conglobate (roll into a ball), which is always satisfying to watch.
Indian stick insects (Carausius morosus)
Feed them bramble leaves (free, grows everywhere in the UK), mist lightly every day or two, and clean out frass periodically. They don't need supplemental heating in most UK homes. They reproduce parthenogenically, meaning females produce fertile eggs without mating, so you'll get a self-perpetuating population with no effort on your part.
The only maintenance issue is egg management. Females drop eggs constantly, and each one can hatch into a new stick insect. If you don't want an ever-expanding colony, collect and freeze unwanted eggs.
Giant millipedes (Archispirostreptus gigas)
Once the enclosure is set up with deep substrate (10-15cm of topsoil, rotting hardwood, leaf litter, and calcium), a giant millipede mostly takes care of itself. It eats the substrate, burrows, and goes about its business. Top up substrate as it gets consumed, offer fresh vegetables and fruit weekly, and keep the humidity at 70-85% with regular misting. Check conditions a couple of times a week.
They live 7-10 years, so this is a longer commitment than some people expect. But the day-to-day effort is low. The main thing to watch is calcium supply (cuttlebone, crushed eggshell, or oyster shell) for healthy moults. All wood in the enclosure must be hardwood. No pine, no cedar, no spruce. The phenols in softwood are toxic to millipedes.
Hissing cockroaches (Gromphadorhina portentosa)
Madagascar hissing cockroaches are big, calm, handleable, and about as bulletproof as invertebrates get. They eat vegetables, fruit, dry dog food, leaf litter. They need a warm enclosure (22-28C), moderate humidity, and egg crate or cork bark to hide in. Clean the enclosure periodically to manage frass buildup.
They breed readily, so you'll have a growing colony unless you separate males and females. Nymphs are born live (well, ovoviviparous: eggs hatch internally and nymphs emerge from the female). A colony of hissers in a well-maintained tub needs maybe 10-15 minutes of care per week.
Darkling beetles (Tenebrio molitor adults)
You probably know the larvae as mealworms. The adults are small black beetles that live on bran or oats with vegetable slices for moisture. They're not much to look at, but they're about as low-effort as it gets. A tub of bran, some carrot slices swapped out weekly, and room temperature. Done.
They breed continuously in the substrate, cycling through larvae, pupae, and adults. It's a self-sustaining colony if you keep it fed. Useful as a feeder insect supply if you also keep jumping spiders or mantids.
Species that aren't as easy as advertised
A few species get labelled "low maintenance" online that don't really deserve it:
- Cubaris isopods: need tightly controlled humidity (75-90%), stable warmth, and excellent ventilation simultaneously. Slow to breed, expensive to replace. These are hobbyist species, not set-and-forget ones.
- Jumping spiders: need live prey every few days, specific ventilation, and attention to hydration. Not difficult, but not hands-off. You have to source and maintain feeder insect cultures.
- Mantids: live prey, specific humidity, short lifespans. You're actively managing the animal through its life, not leaving it to get on with things.
The real secret to low maintenance
It's the setup. Every single time. If the enclosure is right, the substrate is right, the humidity and temperature are right, and there's adequate food and calcium, then colony species like isopods and millipedes basically run themselves. You're just topping things up and checking that nothing's gone wrong.
If the setup is wrong, you're constantly fighting problems: drying substrate, mould outbreaks, failed moults, dying animals. Spend the time up front getting the enclosure dialled in. After that, the daily effort is properly minimal.
Twice a week, spend five minutes per enclosure. Check moisture. Check food. Check temperature if you're running heat mats. That's what low maintenance actually looks like. It's not nothing, but it's close.