well aptasia are really a pest that drove me crazy. What I did to full them was feeding my SPS pappone every three days and it cuassed them to explode. the only reason I am telling you this is, If your feeding your tank heavy you are also feeding them. so you ask what did i do to get them out. well I did try aptaisa X and all that did was help them multiply so i don't recommend it as it did not work in my case. but what did work was i remove all the live rock i could in my tank that carved them out of the ock work. I then place the rocks back in the tank and purchased a copper band buttlerfly. Now since then she has been eating what i coudnt get off the rocks. I am happy to report that this has worked for me very well, I plan on return feeding Pappone again starting this weekend and hope they dont return .