I tried lemon and lime juice...niether worked for me. All I did was make the aiptasia mad and caused it to spore more aiptasia.
I took my peppermint shrimp nibbler (the huge green brittle star) to my LFS, he gave me Joes juice in trade. If there are any peppermints left they can eat the little ones, for now I zapped the big ones with Joes juice.
I plan on purchasing some more peppermint shrimp when they have them in stock and I can make a big enough order.