he didnt have the marks when I got him.
he tries to scratch his head or gills on the glass thats why I thought it was some kind of worm.
I have been using copper to treat him for parasite or diseases.
the tang is alone in the aquarium with no stones in it or anything to get scraped on.
could it be some kind of flatworm or fluke?
gets fed 3 times a day with brine shrimp/bloodworm/Mysis & nori