I purchased a Molly one time. The next morning he was gone. Not a fin in sight. I am guessing he became puffer food. By the way, thanks for all the advice with my puffer problems. I did treat the whole tank for parasites. The only only one who did not make it was the skinny puffer. I think he also became part of a vicious attack from the other puffer. I came home and his stomach had been torn open. The worst part was he was still alive. It was absolutely awful. I will never keep two together again!