Joe's Juice works fine (I think it's just kalk paste so you could also make your own) for the visible ones. I would consider a couple of peppermint shrimp for your tank. They will eat all the one you can't see. I had a big problem when I first started and was using Joe's Juice for months but they kept coming back. After I put the shrimp in I haven't seen an aiptasia in 2 years.
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