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Hi. Im wondering what it could be.There is some purple/ish spots on the leaves. ( White Widow Xxl 2 weeks+4 days into flowering.) Canna Bloom 6ml/L and 0.5ml/L Canna Root, Cannazym 2.5ml/L and Atami Bloom Stimulator 1ml/L. Ph 6-6.2
The first leaf looks like calcium defficiency. The second photo looks more like magnesium deficiency. looks like you could also have a nitrogen deficiency starting as well. make sure you are not overdoing it with potassium, it could cause lockout with those other two. and make sure your ph should be fine. Maybe try bumping up to 6.5 and see how she reacts. its not that much difference really. I notice my plants seem show some rough leaves around this time of growth they are using lots of energy and working hard it can be hard to keep up sometimes