K that looks like some sort of nute lockout. Im taking a wild guess that it could be a deficiency of nitrogen or maybe nitrogen toxicity. Either way a good flush is definitely in order. (when in doubt flush em out) And after the flush you should keep a constant eye on your ph and ppm. I would suggest nothing over 6-700ppm in veg and keep them around a nice comfortable 5.8 with an occasional dip to 5.5. What nutes are you using and at what rate are you applying them? And are you topping off your res daily with fresh water? These are things I must know!! haha jp get back at me whenevs. []Deace!