i bought a bunch of LR that had a ton of aiptasia by far the best thing to use is Joe's juice works way better then Lemon juice from my personal experience. Scrubbing the rock is not an option for you so just buy some Joe's juice they sell it at capp ($4 cheaper then the next store listed), FS&M, and probably a bunch of other places. Also the joe's juice comes with a syringe to use. Just apply a drop on the aiptasia and watch it melt infront of your face. Now Lemon juice worked amazingly well on a majano anemone but it did not work nearly as well for my aiptasia. just my 2cents