I woundn't paint it at all i'd just leave it be but yes the upside down bowel with the cut hole and melted edges is a great and cheap way to give him and extra hide. another thing you could do if you wanted it a cereal box and lay it flat on the bottom of the tank then cut a hole out on top of the box that way he can have that underground feeling. Plus its nice and dark and also can be under the hot side and cool side at once.