For the past couple days Glurmo has taken to sleeping behind the Styrofoam background that came with my exo-terra. He gets down into the small cutouts that are in the back for wires and tubing. I honestly don't even know how he fits in there. The first time I had to pull it forward a little bit to get him out (thinking he was probably stuck). I then, put rolled up paper towel in the hole that he gets into. The next day he just stuffed the paper towel down further so he could sleep there. But he got out on his own that night. He's sleeping there again today. I don't know if I should be that concerned with it, but I just don't like the idea of his sleeping back there and potentially getting stuck. So I'm looking for solutions to block that off. I'm not looking for something elaborate like silicone or foam or anything, just something simple. I thought of using duct tape but I wasn't sure if that's safe? I definitely want to keep the background thought because it provides good insulation and looks good. So... solutions?? Thanks