Minimum 6 fish. These fish I acquired from another aquarist (not MAS). Their mother was a beautiful black lyretail guppy (very large and very pregnant when my friend acquired her). I have been growing the fry in a 55 gallon aqm I maintain for a school. Part of our Schooling for Schools program. The question mark on the lyretail comes in because mama was a lyretail but I do not know what dad was. Molly genetics is not my forte. I also don't know their sex yet as I haven't been to the school in a little while.