I'm currently trying to get my flame angel out of my tank. It has killed every other one of my fish through constant harassment. It doesn't nip at corals, but it ruthlessly attacks any other fish.
Is it in a small tank? I have a flame angel that bothers no one, not even the Coral beauty in the tank.
EDIT: IME fish that people sometimes find aggressive are often that way because they are not provided with the correct habitat. I also keep 3 sixlines which many people find aggressive but mine bother no other fish. Plenty of space with a lot of rock to cruise in and out of hunting has worked for me.



