We got 3 pieces of coral for our reef tank yesterday. The salesman wrote down the names for me but I don't have them on hand. Anyhow, they all shrunk down to nothing when he fetched them from the tank for us in the store, but after a while of being in our tank only 1 of the three has not "opened" back up. It is a "meat" coral and looked something like big hamburger patie or clump of chopped meat in the store. Now it is closed up very tightly and looks like a rock. Any idea how long this should take to open up or how long to wait before considering it a problem that it hasn't? Anything I can do to help it along?