I would close the whole top in and have a visible bell off air up to with hidden blue low wattage spot lights to creat some shadows... wonder if theres any cave critters you could keep up top, a hissing cockroach maybe!-) ambitious as usual!-)
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Not a bad idea, get some meshing going up to the roof where the tank is, toss some cave crickets in there, maybe a few red and green cave salamanders.
