I just put a live rock in the tank a week ago. As I put the rock in the water a pistol shrimp came swimming out pretty fast and hid underneath another rock. I looked like he set up a home the first day but the third day I lifted up the rock and he wasn't there. I haven't seen him since the first day. I haven't heard him at night snapping his claw so I think he is dead. Today I lifted up all the rocks and shook them around still no shrimp. I hope he is not dead. Do you think he is dead because of lack of an acclimation?