HI there im new to this forum. We have a 90 litre coldwater tank and one of my danios stomach was very swollen for weeks. It was behaving normally otherwise. Now its like the bulbous belly has burst? and am worried as my bf sticks his hands and arm in tank. When cleaning. and he has scatches due to.pet cat. Ive read bout fish TB and worried as humans can catch this. What was the lump or bulge on my danio? Help would be much appreciated.