HITHERE
Ive red your delamma and after looking through some fish mags i came upon this article.hope it helps.this infection is commnly known as black spot or black oodinium.it is actually turbellarian worms wich attach themselves to the skins off the fish.heavely infested cases will show signs off attachment over the gills as well.this is fatal if not treated as in the later stage skin haemorrhaging occurs resulting in secondary bacterial infection.to treat the fish you must remove it from any aquaruim containing invertabrates as a copperbased medicine is required.such as cuprazin another course of action is to perform freshwater dips for 10-15min for 5 days however this must be monitored closely so you do not overstress the fish.for some reason fish originating from hawaii are most at risk.this is quated from an fishmag ive got so i wont be able to give more advice.