I also agree and dont think its fish TB. The symptoms of lack of growth and loss of weight are also symptoms of internal parasites. And I haven't found anywhere that said TB causes a fish to stop growing. I'm not sure if your growth expectations are super high but I can't for certain say this is fish TB. Also in 3 or 4 years here you're not only the first cause I read about with you orginal posting from last year until now. The fact that you've gotten it multiple times make me question if it really is. Bottom line is you need to give us more than fish thins out and dies. If you gave more symptoms like fish dropping scales, ulcers, deformities, and loss of color. Best thing you can do is preform an autopsy on the BP when it passes and look for deformities and legions on the kidneys