It didn't come out last night when I fed the tank.. And again haven't seen him at all today.

I think it may have been trapped in one of the pistol shrimp caves when it collapsed. Should I remove the live rock and look for him??

pistol shrimp would be really mad if I do though. He's got caves and tunnels underneath all of it. Also if it did die would the pistol shrimp and halloween hermit crab have eaten it? Only other possibility is it jumped out but I don't think so.