I put aluminum foil across the back of my medium reptibreeze cage. Used to have across the top too but it got too hot. Aluminum foil is easy to custom fit to any size you need.
Calcium
Forgive my newbie comment/question, but why do I need a calcium supplement if Herptivite has Calcium listed on the side of the container? I thought that meant it has Ca in it. I've been dusting my cham's crickets with that ever since I got him in December & he's doing okay, growing...