I just acclimated mine yesterday and as soon as I set each one on the sand they came ot and started eating immediatelty. I watched them for a while and went to eat dinner myself. When I came back they were mostly in their shells probably resting. this morning they were out and about exploring and eating. If you acclimated them properly they should come right out. If they are not out they me be stressed a bit from the changes but I am not for sure on that.