50 gallon
I got the idea for putting all the heat sources, both UTH and heat lamp on one side of the tank from a boa website. In my particular situation, this does give me optimal gradient temperatures. My hot side is 90-93 degrees, my cool side is 78-80 degrees with RH of 55%.
I use Eco Earth as my substrate to assist with humidity. This setup is not the best for air flow. What you see on top is a towel covering a piece of a card board box wrapped in tin foil to help keep both the heat and humidity in. The towels are always kept dry, never damp. Once a day, I will take off the tin foil to completely expose the screen mesh to help with air flow.
Also here is an image from the boa website that helped illustrate the lamp/UTH setup.
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