I can't tell if Dane has thick/scabby scales on his forehead? He has looked like this since I got him so I don't know if it is coloring or something else? The scales don't quite match the yellowish coloring on his back. He doesn't seem bothered, so I am not sure what it is (if anything). Someone posted something similar but never posted pics, so here are my pics. Any ideas?
He is in a divided tank and the other guy doesn't seem to have the same issue, but can't be 100% sure since his coloring is so different. Temp constantly at 80*, aquarium salt, approx 6 gallons total, 3 gallons each.