Sheesh, that's a lot. Good thing you don't have to deal with that. Pretty, but, yikes.
Do you have bone cutters/coral cutters? You could always just take off the bit of rock they're attached to. It should grow over with algae quickly, so you won't notice the chipped spot.
Kalkwasser, IIRC, is basically the same as aiptasia-X and should do the job. I would run lots of carbon during this, of course.
An option for small ones would be to just cover them over with coral putty. Annoy them with something until they shrink up, then smother 'em.
I'm sure you know this already, but, don't touch the blighters. Don't point them at your eyes, either.