Hi! I was wondering if anyone had some advice about how to treat this calathea? I was out of town for a week and when I returned the plant had brown spots. The spots are spreading over the whole plant and the leaves are wilted (soil is not dry). It's grown indoors in a southern window in a 6-inch pot. I always water it with distilled water. Attached are pictures on the plant 3 months ago in it's glory days, and of one of the affected leaves today
