I have yasha goby that lives in a large moonsnail shell. He used to live in a candy pistol shrimp burrow, but the shrimp decided the shell was easier to maintain and the goby followed. When the shrimp died after a failed molt, the goby decided the shell was prime real estate and he stayed there. Because of hair algae, I recently removed and scrubbed some of the rocks in the tank, which caused my bubble tip anemone to move a little bit in protest. Now the anemone's tentacles are blocking the goby's exit for most of the daylight hours, and he isn't coming out except to eat now. It has only been 3 days, so the goby could still be stressed from the tank maintaince and the anemone might move back. Should I move his shell to a different area of the tank or leave him be? Also, since I'm already asking about him, how do I introduce another pistol shrimp? Should I remove his shell if/when I get him a new shrimp? My LFS has a tiny baby candy pistol shrimp (quite a bit less than 1cm long, the smallest I've ever seen for sale). Would the goby or other tank inhabitants eat it if it's that small? I miss seeing the shrimp and goby together.