My convict tang I've had for atleast 2 years now is starting to show signs of something. I don't know what it is and it seems like it could be something bad. It's like an orangeish spot near his spike on his side, he keeps scratching it against a shell and seems to be hurting himself, like scarring himself up on that side. Right side for comparison, I can't get a good pic because he never stops moving...
PLEASE HELP
PLEASE HELP



