Apparently I’m an idiot then. 
According to my handy nutrient excess/deficiency chart, the symptoms of magnesium excess are “stunted growth, dark green foliage, appearance of an overall salt toxicity.” I gave one of these plants an extra 1/4 teaspoon of epsom salt in a pint of water about a week and a half ago. The first picture is before the extra epsom, the second and third from a few days later and the last one today. See if you can guess which one got the extra?
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