Try looking at this. It is a sticky from our disease forum.
Velvet Disease (Oodinium)
Coral Fish Disease, Amyloodinium
Fine gold-white "dust", rapid breathing, erratic behavior, flashing, clamped fins, lack of appetite
Amyloodinium pillularis infests fish in freshwater environment whereas Amyloodinium ocellatum infests fish in saltwater environment. The fish will look like they have been poured with flour as the spots rapidly spread.
This parasite is a dinoflagellate that can easily spread to other hosts hence it is very contagious. Poor water quality can attribute to their rapid reproduction.
Freshwater dip, hyposalinity, Copper Sulfate, Atabrine (Quinacrine hydrochloride)