Angel fish are always risky and esp Flame Angels. Trying to get them out is a real pain as you well know by now. Short of moving 1/2 the rock to the other side and trying to herd it into the open, you can rig a fish trap or suspend one of those mesh breeding refuges for baby fish and let it get used to it while not feeding for 2 or 3 days then drop food in the net and pull it up when the falme angel goes in for the food. Good luck
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