In article ,
(john chappa) wrote:

"atypical mycobateria"--is (apparently) common in fish. It is a type
of bacteria that very,very rarely affects people , too.

How can I treat my home aquarium (tetras) for mycobacteria?

You can't

Very good article here

http://members.optushome.com.au/chelmon/Myco.htm

Roger Sleet
Roger's Aquatic Pages http://www.sleet.plus.com