Peppermint Shrimps actually did work for me, but it's hit and miss. I put 3 of them in and never saw them again. They did nothing. A few months later out of frustration I got 3 more and in they went. They too completely dissapeared... for about 2 weeks. I thought great, more money waisted. Then I was looking in the tank one day and I realized I had no Aiptasia. They had done it!
I've been Aiptasia free for about 4 months now.