We came home from the expo with 24 powder oranges. If you want powder blue too, know this before you buy: powder orange and powder blue are the same animal, and a tub that ever holds both is a tub that holds neither.
Care legend: powder orange isopod
Get it if you want a fast, forgiving colony. Skip it if you want an animal you will watch all day. They run for cover, so keep the litter thick.
How we rate: difficulty and visibility come from our own tub. Breeding speed ranks our species against each other, from what we see in our tubs. Dated counts are still coming.
What they are
Porcellionides pruinosus is a small, fast woodlouse, native to Europe and now found almost everywhere people live. The "powder" is real: the shell carries a dusty, waxy-looking coating that helps the animal hold on to water. The wild color is a gray-blue, which is where powder blue comes from. Powder orange, oreo crumble, orange cream and white out are all the same species in different colors. Adults reach about 10 to 12 millimeters. They do not roll up. Disturb them and they scatter, fast, for the nearest cover. Keepers report two to three years of life in a tub, longer than the year or so they get outdoors.
Why powder orange and powder blue never share a tub
Same species means they breed together, and the young come out as a mix. A mixed tub is not a powder orange colony or a powder blue colony anymore, and you cannot sort it back. So if you keep both, give each its own tub forever, its own spoon, and do not trust a "powder mix" cup to turn into anything but more mix.
Our tub
The 24 powder oranges went into a 6-quart tub on September 26, 2026, the same night we got home. The tub lives on the shelf we use for fast breeders, across the room from the slow, valuable colonies, and that distance is deliberate. A fast species does not wreck a slow one by fighting it. It wrecks it by out-breeding it: one baby rides over on a crumb of dirt stuck to a spoon, and a few months later the slow tub is mostly the fast species and nothing ever looked wrong. So we handle the slow tubs first and the fast ones last, try to work the two shelves on different days, and on the fast shelf the powder oranges and the dwarf whites come last of all.
The substrate went in baked. We found a bug crawling in the bagged topsoil, so the whole batch went into shallow pans, damp and covered in foil, at 200 to 250°F, then cooled all the way down and got re-wetted with water that had Mosquito Bits soaked in it. The mix is the one in our isopod substrate recipe: topsoil first, rotted hardwood, leaf litter on top, sphagnum at the wet end, three to four inches deep. We picked the adults out of the vendor cups and emptied the rest of each cup in one patch at the wet end, since a powder orange cup can hold babies too small to see. A spoonful of springtails went in the same night.
Humidity, vents, and where they sit
Powders take a drier tub than most isopods. Ours has a damp end with sphagnum and a dry end with litter and bark, with both vents at the dry end on two walls that meet at the same corner. Most care sheets say to vent opposite sides. We vent one end on purpose, because air pulled through the whole tub dries it evenly, and an even tub loses the gradient that lets the animals tell you how you are doing. All of them on the sphagnum means too dry. All of them at the dry end or up the walls means too wet. Spread out means leave it.
Keep the dry end covered, though. A bare dry end is not a dry end they can use; leaf litter over it gives them cover and food in one. Care guides agree they breed fastest at 78 to 80°F, and that is where we are setting the shelf.
Food and protein
Leaf litter and rotted hardwood all the time, topped up when the soil starts to show. A pinch of protein twice a week on the dry side, fish flakes or dried shrimp, pulled after a day or two if it is still there. A piece of cuttlebone for calcium. Powders are protein-hungry for their size, and keepers generally report that a colony short on protein starts eating its own weak and molting animals. A small colony cannot afford that. The full schedule is in what do isopods eat, including the overfeeding mistake that turns extra food into a mite bloom.
How fast they breed
Very fast, by the account of nearly everyone who keeps them: care guides describe a starter group of ten or fifteen reaching several hundred in three or four months in a warm tub. That is the reason people buy them, and the reason they are a common feeder for small frogs, geckos and other insectivores. One note on that, since people ask: a cleanup crew is not a feeding plan. An animal that eats powder oranges between meals still needs its real food.
Our own numbers do not exist yet. In mid-October 2026 the tub is about two weeks old. When we see young we can swear hatched here, the date goes on this page. The plan for a species this fast is to split it every couple of months once it is visibly crowded, moving most of the animals to a new tub and keeping the rest as a backup, and never to split a tub that is not clearly booming. For a slower pace by comparison, see our Montenegro isopod care guide.
Buying them
Ten is a normal starter count. More founders gets you a colony sooner, since the number you start with moves colony speed more than tub size does. Look for a size mix in the cup, adults and smaller ones together, which tells you the seller's colony was breeding. And check the label says powder orange and not "powder mix" unless a mix is what you want. Ours are not for sale yet; we will skim once the colony can lose some without slowing down, which we expect in early 2027. The waitlist is where we will say when.
Questions people ask
Are powder orange and powder blue the same species? Yes. Both are Porcellionides pruinosus in different colors.
Can you keep powder orange and powder blue isopods together? Not if you want either color to stay true. They interbreed. One color per tub.
How fast do powder orange isopods breed? Among the fastest in the hobby. In a warm tub, keepers report a starter group reaching hundreds in three or four months.
How big do powder orange isopods get? About 10 to 12 millimeters.
Do powder orange isopods roll into a ball? No. They run for cover.
What humidity do powder orange isopods need? A gradient with a damp end and a dry end, toward the drier side of what most isopods want.
What we use in this tub
The litter is what the colony eats every day. The powder oranges themselves are not for sale yet.
Mixed Hardwood Leaf Litter, Heat-Treated (1 gallon)
$16.99, free shipping
Cover for the dry end and food for the whole tub. A fast colony eats through it quickly.
Powder Orange Isopods (Porcellionides pruinosus)
Not for sale yet, early 2027
Our own colony, started September 2026 and still building. Join the waitlist and we will tell you when we can skim it.
Every pack starts in our bins. Ours, not a wholesaler's.