You are placed in the same file as those awful kindergarten teachers who shame their students for using the wrong crayon color.You know what I use to do to my mean old ciclid? If I saw him nip someone, i'd catch him in the net and put him on my carpet. I'd let him flop around for a few seconds and let him get dusty. Threw him back into the tank as a giant yellow fluff ball and he'd mellow out for awhile.
You are placed in the same file as those awful kindergarten teachers who shame their students for using the wrong crayon color.
In addition, I am going to say the one thing I am not suppose to say in forum like this. Keeping a fish in a relatively small aquarium is unnatural for the fish. They are intended to live in a much larger ecosystem such as a lake or stream. Fish nipping is one resulting behavior. There is no humane solution that I know of, aside from removing the fish, that changes this behavior.
Fish nipping can be a sign of being cramped-or it can be a sign that the other fish is overly aggressive-and/or it could be a fish asserting dominance.