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I second RR response. Everything I have heard about Joe's Juice has been positive. I too have a few aiptaisia in my tank. Although I only have two right now and they are tiny. I will definitely be making a Joe's Juice purchase sometime in the near future.
Another option is kalk paste. You mix some kalk powder with just enough RO water to make a paste. Then use a turkey baster to "feed" it to the aiptasia. Squirt just a little into their tentacles and they pull it in and melt from the inside out. It works like a charm, but you have to do this slowly (5-10 aiptasia a week, depending on tank size) and keep an eye on your kalk/alk/PH.