You know I have fresh watter dipped every piece of live rock that I've purchased and still managed to have stow aways. This year I have aquired a pencil urchin, 2 star fishes and a few bristle worms even after dipping. One of the starfish was a SPS eating variety and the other which I just found last week was a brittle star fish. They were both babies but I got rid of them in a hurry.