1st Grow plant prob need advise

This is my first grow and one of the plants is not doing well. I am attaching a photo. I tried to look up the symptoms in a book by Jorge Cervantes and it seems to be saying that it is over feeding. Problem is I am not feeding yet.They have only been potted in FoxFarm soil for just over a week with no additional nutes, only seem to want water once a day, under a 1k HPS on a 24 on cycle. What gives? Any help out there?
 

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