HOW I CAME WITH MY CONCLUSION: A friend of mine had a bad outbreak in his fishroom and lost ENTIRE spawns of almost grown up fish. This is not a very common occurence. I was fortunate enough to know someone who knew a fish pathologist who agreed to test 4 of the sick bettas. He is a worldwide expert. Results came back, Guess what? Mycobacteriosis. I talked to several more breeders who had same phenomenon, ALL of them were feeding live worms: The only common denominator. All had had this type of outbreaks before, some stopped feeding cbw and it never showed up again. few years later they decide to feed cbw again and within few months (remember that this disease can stay dormant for up to 6 months, it is a very slow growing bacteria), a new outbreak kills everything in sight !!!