I read a bit about aptaisia before I started my reef tank a couple of years ago. When I started my tank and added live rock, I also added a couple of peppermint shrimp. Now I'm guessing here, but those little guys munched up any little growing aptaisia before they even had a chance to flourish. In the two years I've had this tank ( knock on wood ) I've never seen one little devil. A little luck and a little intervention I think. I heard of those shrimp eating even some of the big aptaisia. My guess is dose the ones you can and let the shrimp do the rest. HTH. cheers