I just noticed my Jawfish being dis colored on a majority of his tail and him seeming to be breathing slightly harder. He's still moving around, just a bit slower than he usually is. He is a new addition to the tank as of Thursday but I had seen him at the store for several weeks doing just fine with no issues. I noticed him hiding all of yesterday and then today he came out looking like this. Any ideas on what could be causing this and what I can try to do to fix this?
Looks like an injury. Have you seen any aggression? More likely IMO though...have you seen your rock move at all, even the slightest? When these guys dig they can easily displace an aquascape and do this.