What is this on my cardinal blenny? One of the fins look damaged and some type of scaring or something. He scrapes against back wall often. What can I do? I am somewhat new to hobby and never dealt with this. Any help will be appreciated. Photos is after I fed him.
Tough to see clearly, posting under white lights will help, but that could be lymphocystis, a self-limiting viral disease that doesn't require treatment.
As stated white light pics would help.
I know my fang blenny was the object of aggression from some tankmates, they can be quite docile and an easy target.