The way i got mine to open faster was to get a piece of raw table shrimp, kind of smash it so that it is tenderized (this will help release the smell of the shrimp). I would just cut the top off of a 2 liter coke bottle so it was shaped like a dome. Then just put the shrimp on top of the sun coral and place the dome over the top of the coral. This worked really well for me, and made them open much faster when i would bring them home from the store.