Here's a site that has a pretty good list of fish diseases, as well as treatments for them.

http://www.skepticalaquarist.com/docs/health/helman.shtml

Hope this is helpful! Of course, feel free to post problems, as everyone is here to help!
Perhaps this could be pinned?

I order meds from
http://www.fishyfarmacy.com/

They have a good diagnosis system, a help line you can call if you don't mind spending a few bucks on a long distance call, and the cheapest meds around, blows away any lfs on price.

Tolak