now this i have seen, put a trio of BN with some goldies and the biggest male would suck onto the side of the fish and when the fish moved he would panic put his lil barbs out and wham rip the tail
i no lol, but puffers are so kool,
ok for real i would say a loach, depending on size of tank, a clown would be best, but if its only a small tank get a dwaf chain loach, just as good