I have attached a video of Butters my Copperband. If you focus just below the dorsal fin on his lift flank he has a small spot of scales that just don’t look right. He’s in my 70 gal frag/grow out and he eats whatever is in front of him mysis, brine, seaweed, mastic, yiu name it. I’ve even seen him eat TDO pellets. Anyway I’m hoping someone will recognize the issue so I can get my little buddy cleaned up. He is my favorite fish so any help is much appreciated. Thanks in advance.