thanks for fast replies. So I can try to take some pics tommorow morn after lights kick off. If you look at pic 1 you can see the fan leaf on the left is green like it should be...but the 2 leaves to the right in the middle are lighter greenish yellow color but the tips are still dark green like the leaf on the left. No I did not run full dose. I am using advanced ph perfect and ran 1/2 dose of everything. I used bloom A & B for basenute, voodoo juice,piranaha,trantula,budcandy,and bud igniter. I ran everything at 1/2 dose and ppms were right at 900. The ppm on chart for wk 1 are 980ppm and even tho i ran everything at 1/2 dose my ppm still came out to 900. I am 18" from top of plants to 1000W HPS,and temps are usually 73-75 under light at plant height. Before throwing plants into flower they were healthy and green. Can you really have signs of nitrogen defiency in only 3 days of flower?? Seeing most of lights greenish yellow leaves seems like the new growth and at top of plant was wondering if it was a sulphur defeincy. Any pointers would be greatly appreciated,thanks fellas.