Clown fish sick

[LiveRock27]

My female clown has some white fuzz on her back. I just noticed it this morning, but I keep a careful eye on the tank and have not seen any signs before this morning of her being sick. She has been eating like a horse, her eyes are not cloudy, she is not breathing hard, and she is very active in the tank. Her and the male are the only fish in the tank and have been in there for about 4 months. I have not added anything to the tank in over a month and that was coral.
Water tests are normal.
What disease am I needing to treat for and any good recommendations on how to treat it?
Thanks.

 

[rydr119]

Look up lymphocitis not sure on the spelling. I had a clown with it as well, kinda looked like a fungus, white, and very lumpy.

 

[LiveRock27]

Thanks, but it looks more like velvet. I think it might be Brooklynellosis.