I have had no better luck with this than making kalk paste the same consistancy.
When I hit them with kalk paste I turn off all flow in the tank except the return fir 12 hours. If you dose them and them blast all of the kalk off it does no good.
I noticed with the Aptasia-X you have to be very careful not get get any on surrounding corals, mushrooms especially. I left a little bit of the stuff on the edge of some of my mushrooms and it burned a chunk out of the parts it was touching. When some lands on the corals I just carefully wave my hand in the water near the coral to stir up the aptasia x so it doesn't rest on the coral. I don't know if any one else had this experience too.