Sorry, i will use a heat mat under the viv, its a big viv i think the dimensions are L36'-D36'-H10 at one end and H30 at trhe other. The old one is about L20-d15-h10. It opens at the front with a sliding glass door. There will be air holes all along the back at the top. I am going to use natural light from the sun to light it as my room is generally quite bright. Sound ok??

Max