Aiptasia X works more or less, but you will have to keep using; or at least I do. I'm sure I have those things someplace in there I can't see. Peppermint shrimps are hit or miss, i've had 3 so far; none which like aiptasia. I've also read that it depends on where the peppermints come from as to whether or not they are likely to eat the aiptasia. Berghia nudibranch are the only thing I know for sure will eat aiptasia and will keep eating them, regardless of size, unless they are all gone. After that, you have to find a new home for them as they only eat aiptasia.