Any thoughts on these lower fan leaves? I was thinking it might be a magnesium deficiency, or could be related to the medium being too wet (stupid sky).
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Do you have any more pictures of the plant so I can give you an accurate diagnosis in my opinion
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I’m sorry for being innacurate, I’ve noticed it happens only in some leaves and you speaked about high humidity, so it can be the mildew fungus, check this pic I found … 
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To me it looks like it was dripped on during feeding it or splashed up I’d cut off the ones that look like mold . It happens should have nothing to worry about but if it is a mold or fungal growing on them cut em off before it spreads to other hosts
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