Red spots on leaves

You have a calcium deficiency, my friend. This would also be the reason for the weak stem that cracked, the spots on the leaves, and also why she doesn't seem like she's doing well in the heat. Calcium deficiencies are more likely to appear when the grower is using filtered or reverse osmosis (RO) water to feed plants, the amount of calcium found in tap water varies, but some tap water has enough calcium to prevent calcium deficiencies. To fix this problem make add a Cal-Mag supplement along with keeping the ph around 6.2 calcium is best to absorb at this range. Hopefully, I answered your question and remember " Happy Growing and Free your mind one puff at a time ".