I added 3 golds and 3 blues (randall's) from ORA in Feb this year. They seem to all get along, the golds are dominant over the blues but no real aggresssion. The golds are also larger than the blues at this time, all have grown quite a bit since I got them. I suspect the blues will still be smaller once they mature but I am guessing. Everyone else in the tank pretty much ignores them, and they bother no one. The yellows are out in the open all the time, the blues put in appearances throught the day but generally remain hidden. Interestingly, mine generally swim oriented like other fish, rarely sideways and so far never upside down. I kept a single yellow a few years ago, I thought it was dead for over a year because it never came out of hiding. They are much braver in groups it seems.