Hopefully you have a deep sand bed where theres rock above and overhanging so that it can tunnel under the rock, safely. Then there needs to be plenty of small rocks, shells, and varios rubble for it to shore up and bunker the tunnel, then the flow has to be directed but gentle to carry food over to the bunker because they dont like to have to venture far from it.
If you can provide that in a spot " you " prefer, then it should move right in. Good luck.