I have done it both ways. I have had 2 false percs the same size, one grows bigger(female) and they got along great. I have bought a large tomato clown and bought a little one later and they got along great. I have bought 2 black small perculas at the same time and they fought the whole time. Now I have 2 false perculas I think is a pair, a clarkii and a yellow tang that all think they are in a relationship together. Oh as the ocean turns. The drama continues, will the yellow tang steal the clarkii from the false perc female? Stay tuned same time same channel.
Eric