hes definitly in the sand under your rockwork, so is the pistol. i have two pairs and three pistols in my tank. didnt see any of them for a month at first. youll hear the shrimp snapping there claw. dont worry they'll be fine. like i said mine didnt eat until they came out. youll see sand piled all over the place in the morning, sometimes there burrows are behind the rocks too, but they will eventually move it up front in the open areas.