Care guide
Dwarf White vs Powder Isopods: Which Cleanup Crew?
Dwarf White or Powder Isopods?
Take dwarf whites if the enclosure is small, humid, or houses something delicate. Take powders if you want a visible, hard-working crew for a normal-sized vivarium. Both are excellent cleanup crews and neither is fragile — the choice is about size and where you want them to live.
| Dwarf White | Powder Blue / Powder Orange | |
|---|---|---|
| Species | Trichorhina tomentosa | Porcellionides pruinosus |
| Adult size | ~0.5 cm | ~1–1.2 cm |
| Humidity | 50% minimum, 80%+ ideal | High |
| Breeding | Parthenogenetic — all female, no males needed | Sexual, fast |
| Where you see them | In the substrate, rarely on the surface | Fast and surface-active — you will see them |
| Protein needs | Low | Moderate |
Where Dwarf Whites Win
Dwarf whites are about half a centimetre fully grown, which is the whole point of them. They work through the substrate rather than across it, so they clean without ever becoming part of the display — and they are small enough to be a non-issue around dart frogs, hatchlings, and anything else that might take exception to a large invertebrate walking past.
They are also parthenogenetic: every animal is female and reproduces without a male. You cannot get the sexes wrong, and a culture cannot fail because you happened to buy all males. That makes them the most forgiving starter culture of the three, and the most prolific.
Where Powders Win
Powder blues and powder oranges are roughly twice the size and far more active. They move fast, work the surface as well as the substrate, and get through waste noticeably quicker in a full-sized enclosure. If you want to actually see your cleanup crew doing its job, this is the one.
They are also famously hardy, which is why they are the species most keepers start with.
Which Should You Buy?
- Small or planted vivarium, high humidity, delicate inhabitants → dwarf whites.
- Standard bioactive enclosure, want fast visible cleanup → powders.
- Honestly not sure → both. They occupy different layers and are commonly kept together.
Can You Keep Them Together?
Yes, and many keepers do. Dwarf whites stay in the substrate while powders work above them, so they are not competing for the same ground. Give the enclosure a proper moisture gradient — a damp end and a drier end — and both will settle into the part that suits them.