What a bummer, sorry that's going on. It almost looks like it could be PH related too, but I don't know. The good news is I think it's completely reversible. The first thing I would do is drain as much as you can and fill the res with nothing but PH'd water. If you have some flushing agent (or if you can get some) it would probably be good to add per directions. Let it sit for 15 minutes or so then do it again. The second time let it sit for several hours (3-12?) before draining and feeding again. But this time when you feed make sure of everything: PH, PPM, and nutrients. If you believe it is N claw, then don't give her so much N. That far into flowering she needs to be concentrating on P and K, and the proper micro nutrients.

I can't tell for sure with the HPS on, but I don't see much yellowing. Usually there is at least a little yellowing this far into flowering, which is an indication that she could use less N. If you have too much it slows down budding, so I would look around and see what people think your NPK ratios are supposed to be at this point of the grow. Either that or don't worry and just switch to a quality bud nutrient. I switch semi-gradually over the first two weeks, then it's all bud nutes and enhancers. For enhancers, I'm trying Fox Farms Open Sesame, Beastie Blooms, Cha Ching in that order. First try, we'll see. Oh yeah, I'm also going to flush this time to see if I can tell any difference. Everyone keeps beating me over the head, telling me what a moron I am for not flushing, so I'm thinking like 50,000 people can't be wrong, right?
:beatdeadhorse: