Hello fish people - I have had 11 minnows in a 60 litre tank for about 18 months. I now have one which has developed a kink in his tail and has started swimming down, rather than across the tank. He's eating fine and quite lively. The others seem fine. I have just googled and there is stuff about fish with bent tails having TB and that the water is dangerous to humans. This has freaked me a bit, as I have just done a water change and cleaned the filters and just washed my hands with soap afterwards...should I be worried, either about the fish, or myself? I wish I hadn't searched now. If someone could advise, that would be great - thank you.