HELP! LOTS of Pics!

I got a 10 pot drip hydro system sitting in hydroton and under a 1000watt mh light that is set about 4 ft from the tops of the plants. Im getting dry feeling from the leaves and the edges are curling upwards. some of the lower leaves have turned yellow and others are having a random brown speckling in them. watering once every two hours for 5 mins. the ph is about 6. there on general hydroponics "flora" 3 step nutes. there on a 12.5/7.5/2.5 ml/gal right now and Im about to step back up to 15/10/5 ml/gal. But anyways I did a flush a few days ago and things have only got worse. Im almost positive I have a deficiency in something. Any ideas? I need help befor they get any worse?
 

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