My tetras if thats what they are are small with a gold streak on them and a black coloring inside the gold stripe. As far as I can tell none of my fish are agressive. Do you think he will servive as half his tail is shredded and the shreadded part has lost its white and black coloring is almost transparent now. No one is bothering him, he is just trying to swim near the top of the tank. Thanks Bren