Noticed the fins of 2 of our angels showing signs of what I would call "fin separation.
Is this a form of fin rot? We have a 65 gallon planted community tank. There is recent stress in the tank as we had 4 angels in the tank that 2 paired off and laid eggs, which did not hatch before being eaten. Three of the angles were beating up on 4th presumably male angel - we removed him. Things seemed peaceful for a few days with the 3 in the tank until 2 days ago and we noticed 2 of the angels sparing a lot. Its about impossible to tell which exactly is the breeding pair so we did not remove the 3rd angel. This morning we noticed the above pictured fin issue.
Question: Do we need to treat the fin issue or will removing the angel to another tank heal the fin issue naturally in time? (Once we figure out which angle to remove :-)