My Oscar has had small indents on his head ever since I got him a 2 years ago. But now they are starting to grow and his scales are becoming inflated!! He was in a 55 gallon and was doing fine and then I got a 150 and he did fine for the first 8 months... But now he is looking horrible.. The jack Dempsey tormented him so the Jack went and I put the Oscar in a med tank with the recommend dosage of Metro MS. This helped the the holes go back down to were they started. I put him back in the big tank and now he has raised scales and the holes are getting rapidly worse. I do an routine water change of 20% every week. The tank has a 40 gallon sump running at 1000gph and the parameters come out just at were they need to be. His diet is 4 market shrimp a week with Hikari gold in between the shrimp servings. The tank mates are a 12" pleco, 18"fire eel, and 3" fire mouth. I don't know if I need to improve my filtration and add more bio/mechanical... I've run out of Ideas and need your help..
