I cover my vivarium screen lid with cling wrap to keep in humidity, which works well in my hermit crab enclosure. The difference between the two enclosures is that I spray my vivarium directly, but use a humidifier for my hermit crabs. Now my vivarium has mold growing on the screen lid.
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From Above

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From Below

My viv is currently just plants, no frogs yet. Anyone know any cure for getting rid of the mold? And is it even harmful? What worries me is that water collects on the screen and gets mold in it, then drips down into my soil.