I'm new at this, but I would think that the towel isn't helping anything. I mean think of it, a towel dries you off, it's not going to keep humidity in. The plexi will prevent the water from evaporating out of the tank. And I would think you wouldn't have to cover the whole thing in acrylic. You could leave a small section open for the screen. And you could always lift off the acrylic to spray into the tank...
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