I got a pair (3 to 5") had 6 but it looks like 2 paired off, of RT in a 75 gallon and the a attacking the rest of the fish. if I remove the rest of the fish is a 75 or a 90 bow large enough?
I keeping 6 in a 55 grow out ATM with eggcrate divider and they all are doing fine. Two of mine also paired off in that same tank. I had breed festae in 55 before at that size and they do fine. Just move out the tankmate or separate them if you want frys.