nassarius bury them selves in the sand wich is good cause they keep it stirred up but also get ceriths and turbos or trochus... astreas are good but if they fall over upside down they can't flip them self back over and they die if you dont catch them first ...what im tryin to say is get a variety so what one type does eat the other will
btw id still wait i bit longer if its only been up for a week to be sure you dont have another spike