I bought a candy cane pistol for my Dracula goby, and they were living in the same burrow (far left side of tank) for the first few days. One morning I noticed there was some digging next to my elegance coral (far right side of tank) and when I lifted it up I saw the candy cane pistol underneath. I gently placed the shrimp back on the left side of the tank and he was back to moving sand with the goby. However over the next couple of days the same thing happened where the shrimp would wander over to the elegance and make a home underneath it. Is there any particular reason why it's doing this?