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Something going on with potassium, I don’t know if it’s an excess or a deficiency but some parts of the stem are red and new growth has thin blades I think it’s an excess causing magnesium deficiency but I’m not sure ffof haven’t fed nutes Temp mid 70s Humidity 40-50

Anyone know what’s causing the curling on the tip of the leaves? The plant also has slight dark spots and a red stem on the affected leaves. I think it’s overwatering but I don’t know. Ph 7 FFOF haven’t fed nutes Indoor grow Veg