I had a brook stickleback that kept chewing the tails off all my native fish. I flushed him. I actually liked that fish, they are very interesting, but it was him or the rest of them. Unnatural selection.
hated tiger barbs when i was little. They are fin nippers and very quarrelsome.
I also dont like fish that are sedentary. Just sitting in one place doing nothing... I dont get the point of keeping fish like that. Id be better off getting a interesting driftwood with the money.
about 10 years ago i had an oscar that liked to bite me. I put him in with some fish that liked biting him but got rid of him before any damage was done.I think my uncle had that rotten S.O. for like 5 years