Well if your carpet is anything like mine, a UTH or heat tape will be worthless as mine goes on the ground to poop and then shes back up onto her pvc gym. I use CHE for her above her her pvc gym and will use a RHP for her once I get her a AP T12. Me personally, I'm not a fan of large glass tanks/cages as they tend to be very heavy and much more fragile than a pvc cage plus they don't hold heat as well and it takes a lot more work to make them work as well as a pvc cage. The crack on the bottom makes me worry as there is no structural reinforcement so placing substrate plus whatever else on there is going to put pressure on that spiderweb crack. I would save up for a AP cage. They are awesome and I was planning on a T12 for my jungle girl with a shelf and i'll rebuild her pvc gym even bigger to fit in the cage better.