I have two tanks up and they both have planaria worms in them. I could see maybe my main tank if any having them because it has gravel but I only feed whole foods, vacuum the gravel twice a week and vacuum my sump once a week. Well my QT tank has them now. It is bare bottom with 3 hang on filters. No where for un eaten food to hide. What gives? Does anyone have planaria problems in there tanks. What can I do to get rid of them. Everywhere I read says to keep the tank clean for a couple of weeks and they will go away. I don't know how much cleaner I can keep it. Could ray poo be a food source for them?