I put 3 Petco females in a 20 gallon and there was one full on wrestling match and some chasing the first day and then they were fine. Then I bought 6 more from a breeder thru the mail and added them to the original 3 all at once, and to this day everyone is fine. I was shocked, I was expecting WW3
The 2 smallest are kind of loners but as they grow I see them asserting themselves a bit more and coming out of hiding more often.
I was prepared to remove one or more if problems arose but it never happened and I am greatly relieved. There is nothing like a tank of pretty colored girls
<<<<Mercedes in my avi is one of them. The spots are dirty glass, not ick!