I use Joe's juice but Aipteasia x and kalk paste work also. JJ in combo with a peppermint shrimp got rid of all the ones that i could see in my tank. Get a hold of Tim, he has some peppermint's he's bringing to the meeting next Tuesday.
I used to use Joe's... tried Kalk paste and all other sorts of "remedies".
Started trying Aiptasia X a while back - that's the bomb... thicker than Joe's and doesn't allow the little boogers to expel their reproductive stuff so it gets them on the first try.
the only problem with using any "juice" is that you have to keep using it -- get a copper banded butterfly and it will take care of the problem forever.
granted CBB's are not the easiest to acclimate -- but once settled in -- they are a joy to have and keep the aiptasia in check.