how do they look? any suggestions?

I'm currently growing 6 plants. They are under a 400w and a 150w hps light. I'm using miracle grow soil. The strains are: (2) bubblegummer (3) G13 labs pineapple express and (1) unknown. They are 10 days into flowering and I don't see any preflowers or anything on most of the plants. Most of the plants look healthy just leaves turning yellow and dying off. two of my PE plants leaves are high yellow and the other one is dark green, I wonder if they are high yellow because they need more nitrogen? I just want to know how they look and if anyone has any suggestions based off the info I gave or the pics 20130607_130224.jpg20130607_130237.jpg20130607_130245.jpg20130607_130302.jpg20130607_130320.jpg20130607_130329.jpg20130607_130335.jpg20130607_130341.jpg20130607_130345.jpg20130607_130353.jpg20130607_130414.jpg
 
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