I use glass stones as a 'substrate', and I have just the lamp at the side of the cage. It's aimed sort of sideways across a corner of the cage so that she has that whole area for warmth. I also have two water dishes in there and a big tree she climbs on. Initially I thought maybe she got stuck inside the tree and hurt herself getting out (I've seen her in there before) but I still freaked! I'll definitely find a vet.. But will she be okay over the weekend until one is open?