Okay I bought one and the guy at the aquarium store said he would do fine with my community fish, only 3 days later 3/4 of my fish are missing their tails, and one is missing. I feed him every day and he always eats. I have seperated him from everyone else by putting him in a big mesh thing I bought for when my other fish had babies. So do any of you have these fish Eel things, Is it him doing it? I am a new aquarium keeper, so we have started out with easy fish, Fantail Guppies, etc..I just thought I would ask before I took him back, or is there a disease or something I don't know about where they loose their tails, but then there is still the case of Sunshine missing, no body to be found. Thank you for your help.