My Naso tang has a faint black gray blotch on his side in the same spot on both sides of the fish, and a few black blotches around his fins. These aren't small dots like black ich. The blotch on the sides is more circular with no dots. Any suggestions on what this might be? I have had him for 5 years with not one problem in his health. Still eats vigorously and all other fish look fine. Thanks!
Christa
Christa
