I’m conscious about as a minimum two incidents of fighting fish that have learned to eat neons after being placed in a bag with them. The fish will obviously proceed to eat neons in an aquarium now that it has found out. Fish have a superb memory. Fighting fish have large fins and are gradual. Fish that pinch fins are particularly dangerous to them. Tiger Barbs, Red Eye Tetras, Serpae Tetras, Some Galaxies, and Rosy Barbs are one of the most fish that can be fin nippers and will not be kept as combating fish buddies.