I purchased a screen cage at first but decided to make her a bigger encloser, I painted the entire closet with Kitz then wrapped it in plastic, I had them plastic panels that I added just to add more insulation. I thought I just purchased black, but the color pack came instead. Hopefully that will take care of mold. I am a little nervous now that you said that about mold behind everything. I added a basking light and a screen between the lights. I put in soil and sand mixture at the bottom after I layered another layer of plastic. I planted the trees right in that. I added some plants up higher, but it will take some time to fill in. I think I am happy with it but let's see if Ell likes it.