They are not difficult to culture at all. I use hardwood charcoal for ease of use, but I have heard others have good luck using peat. Feed them white rice, and cucumber peel. The food should be gone in 3-4 days, then feed more 3 days after that. To get them started in a tank put lots of them in, if there are frogs in the tank move some substrate and put them in and cover them up so frogs dont eat them all. If you have any more questions feel free to ask.