Care guide
Dwarf White vs Dairy Cow Isopods: Which Should You Buy?
Dwarf White or Dairy Cow Isopods?
These two are at opposite ends of the isopod range, so the choice is unusually clear. Dwarf whites are a quiet micro cleanup crew. Dairy cows are large, hungry, and as much a feeder animal as a janitor.
| Dwarf White | Dairy Cow | |
|---|---|---|
| Species | Trichorhina tomentosa | Porcellio laevis |
| Adult size | ~0.5 cm | ~2 cm |
| Humidity | 50% minimum, 80%+ ideal | 40–70% — the driest of the three |
| Breeding | Parthenogenetic — all female, no males needed | Sexual, fast |
| Where you see them | In the substrate, rarely on the surface | Large, bold and constantly moving |
| Protein needs | Low | High — wants protein weekly |
Where Dwarf Whites Win
Dwarf whites are four times smaller and stay out of sight, working through the substrate rather than across the glass. In a humid, planted enclosure with small or delicate animals, that invisibility is exactly what you want.
Being parthenogenetic — all female, reproducing without males — they are also the harder culture to kill. There is no sexing to get wrong and no risk of buying a group that cannot breed.
Where Dairy Cows Win
Dairy cows reach about two centimetres, which is four times the length of a dwarf white and a great deal more animal by weight. That matters in two places. In a large enclosure they shift waste at a rate no dwarf species can match. And they are big enough to feed out — a use dwarf whites are simply too small for.
They also tolerate a drier setup than most isopods, which makes them a better fit for an enclosure you are not keeping at rainforest humidity.
The Catch With Dairy Cows
They are protein-hungry in a way the other species are not, and want a small protein source weekly. Skip it and a hungry colony will go looking for protein elsewhere. Feed them properly and this is a non-issue — but it is a standing job, not a set-and-forget culture.
Which Should You Buy?
- Small, humid, planted, delicate inhabitants → dwarf whites.
- Large enclosure, drier setup, or you want feeders as well as cleaners → dairy cows.
- A big bioactive build → dairy cows for bulk waste, dwarf whites underneath for the fine work.