We are new parents to a 3 month old Spotty. I made a rookie error and have bought a heat mat for glass but the bottom of the tank is metal. I have attached the heat mat to the side because of this. Is this ok or do I need a more radiant or direct heat source? If i need to change it what do you recommend? I would rather a different heat mat or heat rock than a bulb. What do you think? Photo attached to show set up. As he is small he stays in the smaller box near the heat mat and we let him out to explore also. Thanks for your help!