Originally Posted by FIshman72B
Sounds like pop-eye to me. Treat it with a formalin bath.
Formalin is a parasitic medication and would not be effective for a bacterial infection.
Is this a new fish?
I used meracyn get rid of pop-eye in my butterfly. It seemed to work pretty quickly. You might try that. Its best to have a qt, but you can get away with treating the tank.