1000w MH??? 2 feet is way to close for those young plants...that is as close as I run my 650w. 400w MH/250w hps...You look like you are wilting them either by burning
them, because your light's too close or you have overfertilized...young plants like these in hydro you should run 25-33% nutes mixture, not the recipe on the bottles, especially if you are new and growing with high priced seeds...IMHO...goodluck...
remember weeds will grow with no fertilizer, too much does not increase potency, it kills them...............