I think your problem is your nute recipe or lack of.... Hydro is very easy to mess up and well by the looks of your pics, it looks as though you haven't done enough research on the matter....

Click on the link in my signature....PPMs Made Easy to Understand.... If you still have questions about nutes after reading the two page thread, come back here and ask.... But I honestly think a balanced nute recipe will make all the difference!!!

CGI::::::

Also - Are you using only 1 - 1000w lamp for all those plants??? If so, they'll do much better with a 1k over the buckets and the other over the cubes....