Ill try to keep it brief. I bought a 112 Red Sea setup that the previous owner had let get out of control with Aptasia. Maybe 100-150 that I could actually see. Did my best to physically remove the ones I could but there were so many ingrained in the corals it was impossible. I researched all the chemical remedies and settled on Aptasia X. The day before it showed up I was at my LFS and they had a bunch of Peppermint Shrimp and File Fish that had just come in. I bought 4 Peppermints and a File. Put them in the tank with the plan to nuke the biggest/most exposed Aptasia with the X when it showed up the next day. I woke up the next morning and I could only see about 20 Aptasia and the biggest ones were gone. The X showed up that afternoon and I didn't even open it. By the next day I could only find 2 Aptasia. Now a week later and there are none to be found, and I've been looking hard. Whatever happens it is after the lights are off. The file fish hangs in a corner all day and I rarely even see the Peppermints. Not sure if my experience is a one off, but I much prefer this method than the chemical way. Hope this helps someone else fighting these things.