Giant Millipede Enclosure Setup

Giant millipede care comes down almost entirely to one thing done well: deep, correctly moist organic substrate. Get that right and this is a genuinely low-maintenance pet to keep long-term.

Enclosure Size

A minimum of 10 to 15 gallons for one adult, with many keepers recommending something closer to a 36x18x18 inch enclosure, roughly a 40-gallon equivalent, or a 20 gallon long tank. Floor space matters more than height for this ground-dwelling species. A secure, tightly fitting lid is essential, millipedes are capable climbers and genuine escape artists. More than one adult is fine and normal, since this is a communal species that will cluster together even in a large enclosure, as long as space, hides and food are all abundant. What limits a group is crowding, which brings stress and competition for resources.

Temperature

72 to 80°F suits this species well, and normal room temperature is often sufficient without any additional heat source. Keep the enclosure away from direct sun and drafts. A low-wattage heat mat is only worth adding if your space runs consistently cold.

Humidity

70 to 80%, achieved by keeping roughly a third of the substrate genuinely moist, misting once or twice daily with a fine mist spray bottle, and ensuring good cross-ventilation to prevent mold and mite problems. Monitor with a digital hygrometer rather than guessing.

Substrate: The Single Most Important Element of This Setup

This deserves real attention, since substrate for this species is both habitat and food source at once, not just decoration. Provide 4 to 6 inches of pesticide-free organic topsoil, such as this Milli Mix millipede and isopod substrate, along with decaying hardwood and hardwood leaf litter, oak and beech both work well. Leave coconut fiber out: it gives a millipede nothing to eat, and an exotics hospital warns it can cause fatal impactions. Avoid softwoods like pine and cedar entirely, their resins are toxic to this species, and never use any substrate material that's been treated with pesticides. Add a calcium source, cuttlebone or crushed oyster shell, directly into the enclosure. Skip it and the exoskeleton goes soft and the molts start failing, the same calcium-and-molt link covered across species in the invertebrate molting guide.

Diet Basics

The substrate is most of the diet. Decaying hardwood and pesticide-free hardwood leaf litter, oak, beech and maple, is the staple food itself, and the floor it sits on at the same time.

Fresh produce is a supplement on top of that: cucumber, carrot, sweet potato and leafy greens, plus small amounts of fruit such as apple, banana, melon or mango, offered every two to three days and taken back out before it molds. Calcium stays in permanently instead of going in on a schedule, a cuttlebone or powdered calcium carbonate left on the substrate for the animal to gnaw when it needs it. So is water, in a small shallow dish with a few pebbles dropped in so nothing drowns in it.

Lighting

None required. This species actively avoids bright light. If you're running live plants in a bioactive setup, a low-output 6500K plant light is the only lighting worth adding.

Cleanup Crew: Display Tank Yes, Breeding Tank No

If you're building a bioactive enclosure, isopods and springtails can go in with the millipede. Millipedes do well housed with cockroaches, isopods and other humid-habitat bugs. The one open question is eggs: there is some concern the tankmates eat millipede eggs, and nobody has shown that they do. Keep a cleanup crew in a display tank, and leave it out of a tank you are breeding in.

Running a Breeding Tank

A breeding tank is the same enclosure with more substrate and less disturbance. Deeper substrate means more food and a smaller chance of it drying out, and every full change risks the eggs and hatchlings, so change it as rarely as the tank allows.

• Eggs. A female builds a chamber under the soil and lays her eggs in it, so the eggs are out of sight in the substrate, not on the surface.
• Substrate changes. Sift old substrate through by hand before discarding it, since eggs and tiny young are easy to throw out with it.

The hard part is getting a pair. Juveniles cannot be sexed, and the species has never bred well in captivity. Animals sold as Archispirostreptus gigas are not always that species either: long-held zoo stock displayed as giant African millipedes has turned out to be Spiropoeus fischeri, a West and Central African species. The giant African millipede encyclopedia profile covers the wild animal.

Sources & Further Reading