It has got the cork tile exo terra rock background, I was considering ordering 2 of the 12x18 pieces to put on the sides, inside the tank, which would help tighten up the space and provide less visibility. Right now I have foil and duct tape covering most of the screen top to trap heat and humidity, and hand towels draped down the sides to block visibility. Do you think the cork tile pieces would work as well as the foam board, in terms of insulation?