Dirtbag
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Ok my best guess. I would feel confident if you are in agreement. Knats I think are an after the fact addition but no way to say for sure.
I think the gnats were drawn to those dying plants like fruit flies to a banana peel. They're a pest but they wont do that kind of damage to a plant. When leaves start getting crispy it's because the excess fertilizer salts are literally dessicating them.