i realy need help on whats wrong with one of my plants, im new to the growing side of things. the leaves are curling under... i have attatched pics. the plant i have shown is 3 weeks old tomorrow its on hydro... nft tank. unkown strain as to a mixed pack of seeds from a mate. im using power grow...leaf A + leaf B. i had the water and nutes on for 15 mins every 2 hours. i check the ph daily of feedings and runoff... ph is 6.2-6.4 THANKS IN ADVANCE