I've had 12 cherry shrimp in my 5 gallon for a few months and I haven't seen any signs of breeding, no berried females. Parameters are 8 pH, 0 ammonia, 0 nitrite, <5 nitrate, I don't know the kh or gh. Temperature is about 77 F (25 C). They're fed fluval shrimp formula, hikarI algae wafers and blanched vegetables (sometimes). I keep them with two otos (which I may move to a 20 gallon eventually. The tanks also has a few plants and a large clump of java moss. Any thoughts?