you can try peppermint shrimp but they are hit and miss. if the tank is well fed then the peps will eat the food. I would get some vinegar and boiling water and inject them with a syringe for starters. you can use pickeling lime too if its available. and kalkawasser works awesome!!! mix it into a paste and coat the aptasia with it and it melts them away. but the sooner youget started the better, these suckers grow quick