you can try that. Also, simply place the glass so it does not cover the whole top of the tank. I place the glass lid on my paludarium about 1 1/2" from the front. one side is partially lifted because of the power chords running into the tank and this works decently well. I still have to fight small patches of mold from time to time, but venting the tank every day to every other day for an hour or two is helping.
The good news is I have enough ventilation yet I am able to retain enough humid air to grow Java fern emersed now! I have three plantlets going strong for about a month now.