Here are a few pictures and related questions that I have for the experts:

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Here is one of the bugs that I see sometimes. This one is dead and I pulled it out of a tub of water that I keep in the cabinet for humidity. I am only seeing maybe 1 per 1-2 days. I don't believe there are any at all in the fly paper that I have hanging, but I know I have seen at least one of these walking on a leaf. Fungal gnat?

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It's hard to see in this pic, but the large middle leaf in the lowest cluster has folded edges because the leaves on either side grew into it. It still appears healthy but is this normal?

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There are brown spots on some of the lower leaves in this pic. Again, possibly difficult to see. Possible nutrient or heat burn? The other 2 plants do not have these brown spots on any leaves.