Wow, yes. Excellent. But how is this fish doing??? I did miss this as I was in So Fla doing some Hurricane Relief, as well as personal relief for my family who lives there.
Posted him up in the Diseased Fish Thread. Poor guy, must have been pretty uncomfortable. You must treat brook immediately, so I hope he is ok. Any other clowns in the tank should also be treated.
I don't know what your water quality is but I can assure you that this disease has nothing to do with water quality.