I had 3 in a 60 gal and they didnt bother eachother 1 bit. 1 was b and w the other 2 were percula, but they came down with something and i couldnt save them. (you gave me some advice on that thread i started). Anyway idk if they were stressed from competion or what induced the illness, but they got along fine while they lasted and they were all the same size. I plan on doing 2 or 3 more, but not until i get to the bottom of any issue in my tank. Im waiting at least 8 weeks to see if the other fish have any issues first.