Hey, just looking at your cage picture again, I'd use 1" styrofoam on the back (behind the Reflectix) and same for the bottom. You are losing a ton of heat from those areas. Just use Reflectix on the side. Before doing so, get yourself some nice background paper for the outside and tape it in place. The you won't see the insulation from inside the cage and it will look nice. Cut a full top cover of Reflectix for over your screen and use a razor knife and cut around your heat lamp skirt and then the light will have its custom spot on the top. If you need humidity, a damp towel between the Reflectix and the screen will work great.
Sadly, this is what happens when we buy glass tanks. The good news is you can make them work although 50 gal is about max.
If you are doing belly heat, put your probe between the outer bottom glass and the UTH. Then tape the Reflectix over that. There should still be enough air in there and the insulation will help the UTH heat stay in.
Hope this all works for you.
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