Dear Chris,
Information on mycobacteriosis (Fish TB), the most common chronic disease of aquarium fish, is on my book's website:
http://www.atlasbooks.com/marktplc/00388.htm
My article (Mycobacteriosis: The Stealth Disease) is available there as a free download. The section on stress as a factor in disease resistance is something that
everyone should read.
I will be updating this article in the next few months so comments are welcome.
Diana