Help!

Hey , I don't know what's wrong with my plants , the new growth is drying out and the are folding like tacos ! And rite before the leaf stem gets to the leaf is red ! Older growth isn't doing it ! Its a DWC system with 200watts of cfl 4 2700 k and 3 6500 k well ventilated ! Please help!! I use. B.C nutes
 
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