Dude, Please go back to the 400 MH light. 2 weeks old and 1000. You want the MH for veg. HPS for flower. And don't get the light too close at least 2 feet untill they can take it. The color of the leaf maybe the strain but maybe that 1000 burning them up. it's not ferts unless it's leaf tips burning.

And get the temps down in the mid 70's . You need a good amount of fresh in bad out while lights are on. Not so much in the dark. Small A/C's work wonders.