Whoa!!! What is that? Looks like velvet to me, but not a clear shot. I would be drowning his food in C and garlic....I know someone will pop in here and tell us what that is.
Can you get a closer pic of that?
I'm guessing its probably some kind of cancer,but thats just a wild guess.
It may be some kind of isopod thats attached to the fish and borrowed into it.
?? What can a person do about that??
Looks like HLLE to me