sick plant?

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This is my first grow. Bag seed from Mexican brick. Using 400watt MH for veg, 600 watt Hps for flower. They started flowering May 20th. PH (soil ) 6.8, run off 6.5. Temp range in veg room stays constant at 78ºF, 60%. Flower room ranges from 79º-68ºF, with 77º as the average lights on temp...