Hello, I recently got rid of my bearded dragons, now I'm left with a 6x2x2 wooden enclosure. I was wanting to split it in half and make each side the equivalent to a 40 gallon breeder to house my leopard geckos. But I don't know how to heat the cage. Is it safe to put a heat mat on the wood? I just don't know how to heat it. Any suggestions would be greatly appreciated. Here's a picture of the cage. Thanks