[BoomerD]

I agree with the tentative diagnosis of brooklynellosis. It's a NASTY parasitical disease that, in spite of the name, "Clownfish Disease," can affect most, if not all marine fishes. Here's more info for the OP. Maybe it will help with a solid diagnosis:

BrooklynellosisArt

ATJ's Marine Aquarium Site - Reference - Brooklynellosis

Treatment of Brooklynellosis(Brookynella) - Reef-Fanatics.com - The Authority In Coral Reef Keeping And Saltwater Aquariums

Advanced Aquarist's Online Magazine - Aquarium Fish: Applications for Hyposalinity Therapy: The Benefits of Salinity Manipulation for Marine Fish