BTW, are you talking about a baby peppermint? If a zoo was too big, that sounds like a baby to me. If its a baby, you need an adult. It will take some months to grow a baby to size large enough to kill a big aiptasia. He will still eat the little foot lacerations though. An adult is well over 1 inch body size. Juvenille peps are quite lightweights and probably won't be able to hurt much till they get bigger.