4 sometimes works, but 5, 6 (or more) would probably be better as juvies. They can get some size to them and can be a space hungry species ime, so when they near maturity they might get fussier with each other, even in a 6 ft tank, and even more so once a pair wants to spawn, which can practically cause a riot over protecting eggs or fry, lol. I had to move my dominant pair to another tank, because they insisted on picking their spawning area in the middle of the tank and didn't leave much of anywhere for others in the group to stay out of their way. So, depending on things like individual temperaments or gender mix, you might grow out a group, then find it more peaceful to keep a pair once one forms.
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