Hey Rob,
I have a couple of aiptasia (ones that are noticible) on some of the recent corals I have purchased and am looking for a way to get rid of them. I ran across this discussion, where a couple of others said peppermint shrimp are fond of acans as well.

http://maast.org/forums/showthread.p...light=aiptasia

But I too was unaware of that.