Here some site to help you find out on what kind of disease your fish have;
Fish Diseases
www.wetwebmedia.com
www.peteducation.com/index.cfm?cls=16
www.aquaticcommunity.com/disease/sw/
www.fishvet.com/
I will gather more to help everyone
Coral Diseases;
www.coris.noaa.gov/about/diseases/