I don't know if this just a one season thing due to El Niņo with rain 4-5 days a week since March, or what, but I am running into TOO MUCH humidity with my glass tanks.
A one piece system wouldn't work. Now, cut in half so it could be adjusted as needed would be perfect. This is what I do with the foil covered cardboard.
Slide one over the other for more air when Humidity is too high.
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