I have had a roughly 9 inch clown knife housed with a 7 inch albino oscar for some time now, and everything has been going great. They get along fine. A few days ago, I bought a Midas Cichlid (about 5 inches) that seems to be messing with my clown knife. Up until I got the Midas, the clown knife was SPOTLESS. I never see the fish fight at all, but suddenly the clown knife appears to have gotten scratches all down his sides. I took a lot of pride in the fact that the clown knife was so smooth and spotless, now he looks beat. Is it from the Midas messing with him? And is there any way to get rid of the scratches??