I'm a newbie, but just 2 weeks ago my celebes had pop-eye and acted fine otherwise. Last week the eye was gone, he did not eat, and was swimming near the top in circles, obviously disoriented and bumping into the tank. I've read that they can survive w/one eye, but I QT
'd him just in case and he ended up dying. I've read that pop-eye can be a tuberculosis symptom, which is very difficult to cure. That's my 2 cents anyway. Good luck.