I got a new octopus last weekend and acclimated him very slowly. As soon as he was let free in the tank he climbed into the live rock and I haven't seen him since. He blends in very well and I have a lot of live rock so he could be somewhere that I really can't see. Is it common for some types to stay hidden in the rock or do most of them come out? I really want to go and start moving the rocks around to see if he's ok. I would really appreciate any information. Thanks!