I have an angel fish that survived a severe case of ick and secondary fungus infection that now has some form of swim bladder disorder. He lays at the top of the water and is unable to swim upright for more than a few seconds at a time. He has been like this for a week. I am currently treating him with Melafix for lack of any other ideas. His abdomen is swollen and he seems to be in constant distress due to his inability to swim properly. Please advise.