This may work but unless you can stay right on top of it you might find your filtration not to be as well if he's digging all the time and leaving empty spots.graham;737506; said:I actually just moved the gravel back and while I was doing so he was getting all hot and bothered my hand was in the tank. He got the usual flared gills mean look on his face so I spread my and hand and showed him who was boss. he backed down.