@Jurdon has given since great advice here.Porcellio laevis ‘Dairy Cow’ are a solid beginner species, and while I’ve not kept them myself they should be kept like most other isopods: a substrate base of soil with bits of rotting leaves/wood mixed in, a top layer of leaf litter, bark hides, moderate humidity, but always offering a moistened corner of the enclosure (laevis, I’ve heard, can handle dry spells but I offer all of my pods a corner of moist sphagnum moss that I keep more humid than the rest of the enclosure). ALL isopods need rotting leaves, but Porcellio species like dairy cows also fancy themselves some extra protein in their diets, and if not offered protein will begin to cannibalize. Protein can be offered through feeding fish flakes, dog food, dead/wounded feeder insects such as mealworms or crickets, and when your culture is big enough, scraps of lunchmeat or even whole frozen-thawed baby feeder mice typically used for snakes. All isopods should also be offered a calcium source to promote healthy exoskeleton growth, best given via a cuttlebone left in the enclosure. The pods will gnaw away at this when needed, and eventually it will need replenished. Other calcium sources include eggshells and calcium powder used for reptiles.
Yes, their care is very similar to millipedes, and Porcellio laevis ‘Dairy Cow’ is one of my very favorite species, if you enjoy them as much as I do, you won’t be disappointed.quite similar to millipedes then i think i'll have a go at raising a colony thanks everyone