Looks Over fert. You have brown tinges. How did the discoloration spread? I know you didn't wake up one day and it was like it, that has taken at least a week to get like that. I'd flush and harvest it cus you are almost near the end of your grow and by the time it recovers it will be chop time any how.. what are the hairs looking like? You need to answer every question that people have raised if you want answers specific to your problem also!