First fish vs power head

[jason604]

I found him now hiding under a rock seems like each time he moves away from the rock he just keeps on spinning and rotating in a odd way that fishes don't do. I was able to catch a few pics. Should I put him out of his misery? Quarantine n medicate? Or let him be. I can't really tell but It may look like he's missing a piece of meat from his belly. Poor guy