The recipe I use with great success is 1 tsp of calcium hydroxide mixed with 2 tbls of tap water mixed together and then boiled in the microwave for 30 sec. Use a plastic syringe to squirt a bit at the mouth of the aiptasia and they draw it in and disappear for good. It took me about a week to get rid of a really bad infestation in a 72g tank and after 2 years they never came back.
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