please see attached - a white spot on one of my zoster butterflyfish, it is the same size and the same spot on the other side of the fish. Is this of concern? My other zoster doesn’t have it. Been in tank for a month eating etc. the spot just occurred about a week ago.
I think that zoster and polylepis are both really prone to odd skin spots and bumps. Usually not anything to be concerned about. That said, they are both are also really prone to Neobenedenia flukes. I don’t think that spot is Neo though.