Leaves from GSC, 46 days from flip, grown from feminised seeds in soil, 20l/4gal pots under 600W HPS.
I use RO water with Shogun nutes: 1ml/l calmag and 2ml/l bloom, keeping water ph in that 6.2-7 range
These leaves come from near the top of one of my plants. Cut them off to get proper lighting on them for the picture.
This is my second grow and the second time I've had this problem, both times it's started around week 5 and I've tried all kinds of recommended fixes. It started slowly with speckled brown spots on the leaves which progresses with the leaves eventually turning completely brown and crispy.
In the first grow i made a mistake of not watering properly to run off and so going in to this run I didn't expect this issue again. I get a good 6-800ml run off from each plant every feed. I've tried a complete flush last week which did not stop the spread of the problem. I thought it might look a lot like a calcium defficiency so I stopped RO'ing my water and kept the same 1ml/l dose of calmag in the last feed 4 days ago but the problem keeps spreading. Before I water them again I really want another opinion on what i should feed them to sort this out.
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