Looks like an injury from a nick or contact with object. I normally suggest to keep an eye on it but this one seems infected with possible cyst and should be treated as a precaution using seachem Kanaplex which is a broad spectrum treatment and absorbed by the fish in a separate tank with added aeration using air stoneHello everybody, I have just noticed a white single dot protruding from the side of my clown curious as to what it could be my other fish are healthy These two clowns have been in my tank for five months. The tank has been established for four years.
