I've always had good luck with a syringe full of kalk paste followed up by epoxing over any stub that is left. I also find it's good therapy to nuke them SOBs
I put a threadfin butterfly in my tank 2 years ago and my aptasia disappeared. Didn't come back except maybe 1 or 2 popped up again last year, but then they disappeared in a couple of days. She's also one of my favorite fish. Always moving and showing off.
joes juice :twisted: it works and won't eat anything else, cheaper than a fish that doesnt like aiptasia and a Berghia that you will never see again once its added to the tank and you don't have to worry if that was the real peppermint shrimp or something that looks like one JMHO