I used Kent Liquid Calcium (Calcium Chloride), injected right near one aptasia hiding in a rock (don't think I actually inserted the syringe into it). I thought it had no effect, but on the third day, he was not poking out of his hole, so I think he's history.
I've seen a few small ones on my glass that I've scraped off, and just noticed one under a ledge. SWF's "Market Leader" package is arriving tomorrow, which includes a couple Peppermints, so I'll have a snack waiting for them
It's too bad they are such a nuisance, because the one I nailed with the Ca really was quite beautiful.