I'm not sure what exactly caused the damage to his tailfin, but the gold gourami is probably the second or third dominant fish of the four in my tank (behind the African Leaf Fish and then the Red Tailed Shark). Mostly the African Leaf Fish chases the two gouramis, the shark chases the gouramis, and the gold gourami chases the blue and gold gourami.
Anyway, suggestions? Stress coat with aloe?
Anyway, suggestions? Stress coat with aloe?