I haven't seen my octopus Sabastian for three days. I last saw him Saturday morning. He looked whiter than normal and his legs looked a little curlier than normal. He just didn't seem right to me. I saw a half eaten crawfish in the tank Sunday. He crawls into the holes in the live rock so I can't move rocks around and look for him. I'm starting to get worried he has died. Do they always come out in the open when they die? Should I be doing something? All of my water test have come back excellent so I know that isn't an issue.