It differs fish-to-fish. I have had a BIG herd of Angels w/no problems, and I have had just 5 or 6 that always seemed to end up having 1 or 2 dominant ones. Sometimes more is better as it diffuses the aggression & helps keep one fish from being picked on, sometimes less of a crowd allows for more "individual space" and there's less aggression. You kind of have to play it by ear.
Same thing w/Discus (they are closely related).
Tommy <9))>>{
Same thing w/Discus (they are closely related).
Tommy <9))>>{