Having an issue with a gem tang that I’ve had for four years or so. He’s having some discoloration has shown in the photos below. In addition to the discoloration he’s scratching on the bottom as well. One qt’ed fish has been added so I would be surprised if he was the cause. Any help would be greatly appreciated. Could this be an injury from the rocks or flukes? There’s a purple tang that’s been in there for just as long as well. He’s not showing any signs of aggression or disease.


