Turn all of your pumps off and squirt the kalk on the 'nems slowly. I use a syringe that comes with a salifert test kit. It will come out like really thick if you slow it down. I usually let it sit for a hour or two before I turn the pumps back on. It doesn't take much to get em.
Lately, I have been using boiling RO water. This is safer around other corals. It melts them pretty good. Squirt it out SLOWLY.
I have had peps eat it. I have also had copperbands get 'em.