[vintner]

Yeah, looks like it's probably nute burn. I didn't realize this was a hydro grow, and like ABC said, you've really got to be on the ball to do hydro. I wouldn't ever recommend hydro for someones first few grows, so I think you're brave. The plant looks pretty good by the way dispite the lighting trouble you had. Are you flowering w/HPS? Try sticking a few compact fluoros in there if you've got the power to spare. Focus them on the lower bud sites. And, consider clipping A FEW of those large fan leaves to help get light to the lower sites, or maybe do some LST AND tie some of those lower branches out away from your main stem. Getting more light to them will help them bulk up and mature faster.