I have 3 Red Serpae Tetras, 2 Tiger Barbs, 3 Gold Barbs and 1 Rainbow Shark in a 20 gal. tank.
A month ago I saw one Red Serpae Tetra lose some of the fin but I didnt see any signs of aggression.
and pretty much everyday I took some time to look at the fish and that Red Serpae Tetra was...