The links provided by Lyndon (L.Bladrey) to the excellent atrticle in Advanced Aquarist don't seem to work. Here is my attempt to get the links correct. This serries of articles will likely tell you more about the disease than you ever cared to know.(smile) For treatment information, pay special attention to part 3.
http://www.advancedaquarist.com/issu...2003/mini1.htm
http://www.advancedaquarist.com/issu...2003/mini2.htm
http://www.advancedaquarist.com/issu...2004/mini3.htm
http://www.advancedaquarist.com/issu...2004/mini4.htm
http://www.advancedaquarist.com/issu...2004/mini5.htm