i hvae a lovely group of 7. soon to double. anywho, they are great fish. mine tned to stya grouped, though i do have one loner who will spend more time alone than with the group. mine are relatively peaceful. eat flakes, though their diet should be varied. they tend to like fast currents as a norm, though i know one person on here insists theirs actually prefers the calmer water. mine will spend most of their time directly in front of the filter swimming in the current. they spend much of their time near the surface so they are great fish if you're trying to have something at every level. they are also different looking, which makes them a nice addition. recommend at least 6, more if you have room.