My new BRB cage is nearing completion, so I need to start considering substrates. She'll need something to help stabilize the humidity, so I'm thinking whatever I end up using, I'll need to add some moss to it. Any advice on specific types of moss that do particularly well with high humidity environments without molding or turning brown too quickly? I'm thinking sphagnum. Also, in order to make her habitat as natural-looking as possible, I'm thinking of making a substrate mixed from organic potting soil, fir bark, and coco-fiber, with a few leaves (either dead and dried, or fake plastic) mixed in. Thoughts? This is the cage.