i get that fish can contract TB, i have no idea how transferable that is to people as TB in people is an airborne infection. as someone who has had TB (thanks uncle sams canoe club, and south east asia), it is something youd rather not catch, but its not a death sentence like it once was. like beardedbillygoat mentions, avoid open cuts, and wash after your hands have been in the tank. all kinds of dangers in life, and you can either live in a bubble, or enjoy life using some fairly basic safety precautions.