They are marble crays. The tank is only a 22g. I think I would have much more success with say a 55g. But one of them is berried right now and there are also a bunch of tiny little guys in there right now too.What kind of cray's are you breeding? Marbles are the best as you don't need mates, they self clone themselves and they are the least cannibalistic outta the different cray's.