Currently I hv 8 large angelfish size fm 1.5 to 7inch. IMO, is better to hv angelfish eating aggressively before putting into display tank. And watchout are they just fighting or going for a kill. If just fighting, leave them alone. But if they are going for a kill, which mean even if one is hiding and the others still hunt him down, I think better decide to catch either one of them out.