I just turn the lights on my tank noticed my little glass knife was swimming near the top of the tank. I've never seen it up there. When I looked closer I saw his tail fin is broken an it looks like its barely connected. I have no idea what happened to it or what if anything can I do. Hes been in my 55 gallon for over 6 months with many loaches an also some archers. I don't think he was attacked but you never know. I'm afraid. If I try an net him to switch him to another tank his tail could break off. What should I do?
