It looks in really bad condition. I suggest you up the nutes it looks like it's not getting enough for flowering.\\ Ask some advise from others first. I'm not good with hydroponics stuff.
Snoop nailed it....did you flush at end of veg, few growers do, a good flush with the last flush being of cal mag or Epson Salts added will fix this, to my blog: http://forum.grasscity.com/blog/1093/entry-9829-flush-baby-flush/
I did flush at the end of veg. I didn't add in any cal mag though. I gave my baby some Dlime and will give her some cal-mag once it arrives.