Fill out the form. You have a pH problem from the looks of things but have given too little background.

NFT is supposed to run more than just while the llights are on btw. Your root zone should NEVER be allowed to dry out completely.
stinkyattic Reviewed by stinkyattic on . WTF!!! Hi every one, Dont know whats goin on this time round and its doin my nut in! So here goes........ plants are 3/4 weeks old from clone.Pre ph`d rockwool cubes 600wtt HPS-18/6. NFT,and they`ve been in the system 11 or 12 days. The pump is just a light trickle running only when lights on. Temps are 81 lights on,not too sure lights off temp,but its in family home.... 125mm intake and exhaust rvk`s. On constant.Humidity 40% On the second day of them being in the system I changed the res and Rating: 5