Yes, I have an idea. Forget the glass and leave it open on top. An open top allows fresh air above the water, promotes good gas exchange, proper pH and a healthy reef.
The next question is what to do for a light. Use sunlight. Some direct sunlight is good but even indirect sunlight is very powerful. For a little boost in color, suspend a supplemental light above the tank for evening viewing. If you like DIY economy, use a common Actinic fluorescent light tube combined with a pinkish colored plant grow tube (the same used in freshwater) powered with an electronic ballast meant for HO/VHO lights. This light combination makes colors "pop". (LED's are great but their price is still overly high)
Aloha,
Mark

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