Actually mine I think are about 2 years maybe little more years old. I think the biggest guy is 8" and the smallest 4.5-5" these guys are literally afraid of their own shadow and other fish. I wish they became these beast they are supposed to be. But ya cant grow if you dont pig out, cant pig out when your afriad of other fish. Idiots? ya. Cant kill em, I love em despite them being horizontally challenged, thought about getting another, but I tried that with 2 albinos and they just up and died at 5".