I have used wood. I like it over glass because a variety of features: weight, ease of work, looks, cost. Yet, if you use both, you get better results.
You can cover the tank with a glass, maybe with a hinged movebale part, or just two pieces of glass, and over it a wooden hood (just like a box) which will hold the lights, and any else you need. Either you make the hood to cover all the top, or just a portion, this turns to be the most comfortable to me. The latter is a bit better if you make a hinged door at the front to drop crickets or mist, without having to lift the whole hood.
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