I would just let it be they will some times burry them selves a night. as long a he doesn't shrink and start smoking you are ok. they can be very anoiying at times moving to an area that they have already gone over insted of going over a new area just let it be and do it's own thing it will get there sooner or latter. If you start moving it around it will become stressed and could die. remember to pass it on with some instruction when it is finihed with your tank.

Bill