They are at the front right corner so easy to see just not where I wanted them. I honestly had no choice in the matter. Within seconds my pistol chose his spot. I think people have luck with choosing spots and blocking the pistol in until he made a cove.
I think they will stay but you can move them if you fill in the cove and force them elsewhere.
Did more research turns out it's a wheelers
shrimp goby. Good for nanos yay
Don't think they will stay in the same spot mine has a network of tunnels that all join together there are at least 4 openings that I see mine in and probably one or two more that I don't know about in the back of the tank. Give him time. You can't force them to build someplace else unless you put a rock that is flat on the bottom at the bottom of the tank. Make sure you have rubble so he can reinforce his cave. Bits and pieces of coral, shells and rock rubble is what mine uses.