I bought this shrimp 4 days ago and he never comes out from behind this one rock. He stays there, hanging/walking around on the back 24/7. Is this normal? I had a peppermint shrimp and he was crawling around the whole tank the same night he was introduced. But after almost 3 years he died. So I was going to get a few more peppermints but my lfs was out and only had 1 shrimp left. This cammel shrimp. So i got him. I'm afraid he's not eating since he never leaves the back side of this rock, but I don't know. Thanks in return