Best thing I got out of my box of Aptasia X was the nifty syringe. I like the angled tip for sticking it to them! The stuff in the bottle didn't seem to do much. Almost all of mine came back a few days later, ticked off and stronger than ever.

The kalkwasser paste is very effective (never heard of warming it up though!) and before I heard of that I used straight lime juice. Works great as long as you punch the syringe into the body of the aptasia.