Mine unexpectedly split into three one day while I was at work, and all the little bits went a-wandering... my little sister happened to be home and was kind enough to move all my SPS frags out of the way before they were steamrollered, but it was close. I wouldn't try it unless you took the SPS out and let the anemone choose a spot without them in there. Also, know that if a powerhead near them ever goes out, they may pick up and move again... That also happened to me!