Unfortunately, Mycobacteriosis is non-treatable. There is no known treatment
to stop it in aquarium fish (human anti-tuberculosis drugs are ineffective)
and it will progress despite your best efforts. The recommended treatment
for infected fish is euthanasia. If several fish become infected in the same
aquarium, it is usually assumed that the survivors are carriers and that
they be treated accordingly. It is generally believed that infected fishes
are the main source and reservoir of mycobacteria in aquaria. Dead fish,
which have died from mycobacteria infection, and live carrier fish, can
spread these bacteria.
I have just uploaded an article on this disease on my web site this morning
and it gives some general information and details my own personal
experience with this problem. It also give you a couple of other sites to visit.
Adrian.
Adrian R. Tappin
"Home of the Rainbowfish"
http://www.ecn.net.au/~atappin/home.htm