Fish books

I bought "Freshwater aquariums for Dummies" it seems to have good basics of disease and treatments.

http://www.fishpalace.org/Disease.html is pretty good in terms of having pics to identify various ailments. I haven't found a book that I thought was reliable and up-to-date on treatments--most of what's on that market are either aimed at aquaculture (which means limited to medications approved for human consumption), or very out of date. IMO, identifying a pathogen on the hobbyist level is very, very difficult. Most of us do not have access to the needed equipment. Beyond 'bacterial', we have no way of knowing if something is gram-negative or gram positive--and often bacterial growths are called fungus by both hobbyists and the companies that produce medications. My best advice--familiarize yourself with the common ailments--ich, fin rot, dropsy, cottonmouth, a few others. Be familiar with proper uses for salt, and a good broad spectrum anti-biotic. Then, have a quarantine tank--and use it. Do your best to PREVENT a problem, rather than focusing on treating one that doesn't exist yet. Keeping the tank healthy with frequent, regular water changes and feeding a variety of foods appropiate to your animals will be better in the long run than having a huge cornucopia of potential treatments to draw on 'just in case'.

Hey that's the best resource I've seen for pictures. That's what makes it a bit easier to identify what might be going on with a fish. It's tough enough if you're not an expert.