<a href=showthread.php?s=&postid=13423887#post13423887 target=_blank>Originally posted</a> by Wolverine
I use kalk, but add one other wrinkle to make it more successful.
I give the aiptasia a piece of food first. It will hold onto the food, and it can't retract all the way into its hole. This makes it a lot easier to stick a syringe into the base and make sure I'm filling the thing up with the kalk. Then I spread a layer of kalk paste over the top of it.