im having a problem, my plants started getting yellow in between the veins. then the tips started curling upward. now its just droopy all over the plant. can some one give me some help ill really appreciate it. im using an ebb and flow hydro system 600w hps, lights are on 18 off 6 hours. im using gh flora nutes. i flushed them for a week and nothing happened they just got worse. my ph is 5.6 ive been doing the same thing since i started so im really clueless as to why this would happen. could it be from over or under watering them. my pump is set to water 6 times a day for 12 minutes.