Started this Dinafem remo chemo from seed Dec. 13, it popped within 8 hours and was a year old seed. It's in Fox Farm ocean forest soil. No nutrients have been added yet. She looked a little droopy in this pic because the lights had just came on. Follow me and I'll follow back.
@StickyGreenThumbs, Have you tried to flush your plants? That is the only other thing that I can think of. I had to do that on my first grow. Couldn't get the nitrogen right to save me. Hope you can get it under control.
@StickyGreenThumbs, I've been keeping my PH at 6.5 - 7 and letting them dry out before I feed them again. Are you using any Cal/Mag? That might help with the deficiency.