@Little Grey Spider it is, and she has chewwed away the bottom little by little as shes grown, as you can see in the photo, and she literally just contorts her way in there. its actually quite impressive
I used to have a really cool paludarium setup in one of those with lots of East Texas native herps. For real, I had green anoles that would dive into the water and swim down to the bottom of the background in order to get underneath and back up there behind to hide. They loved it back there. It was their Clubhouse! And trust me, anoles are not water lizards typically.