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The leaves appear to be folding upwards like a taco? is this correct?

Any ideas on what might be causing these spots? - Details: Sativa, nutrient film technique, Week 6 of 12/12 Ph 5.87, Water temp 74°F, Air 73°F, 400watt HPS, 400watt MH General Hydroponics recirc program up until last week. Fresh Water only this week. 907ppm TDS