It looks like you're suffering from nute burn to me. I have a similar problem with one of my plants, pretty much looks identical to yours. I flushed her, and all the new growth is coming in green again. What kind of nutes are you using? Organic? Chemical? Do you know the strain name?
Also, looking at your leaves it would appear you're under attack by grasshoppers, leaf eaters or something of that nature. Are you using an insecticide? I highly recommend Neem Oil, it works really well at containing, if not eliminating the problem altogether. You can spray in on the foliage or mix it into your water and feed the plants with it (which is more effective)