In the ocean jawfish move their burrows during different seasons, I have seen whole colonies move from shallow water to deep water at different times of year, I have never actually witnessed them moving, but as the seasons changed they would be found deeper and deeper, then the next year they would show up shallower and shallower, between 15 and 80 ft. In tanks they frequently move burrows, I have had them stay in a single burrow for as long a year, then for a month or two would move around at night, then settle on a spot and stay there for a while. I don't heat my tanks, so maybe it has to do with the temp change as a trigger, so if your tank is stable over the year they never get the trigger to move, just know that for what ever reason, even in an established burrow, if they decide to move you need to always have your tank covered to prevent escape and death on the floor.