Can anyone tell me whats wrong with my week 7 plants?? cupping down turning yellow

OK I min week 7 and like to go to week 9 but had to cut it short and flush early because
i though I over fertilized them. my last to waters was with GH KLEEN. can anyone tell me why my leafs (foliage) is looking like this? It started in week 5 and got a bit worse but not much. there under a vented shade thats 1ft-1.5ft above the top of these plants
Thanks

its just N defitency totaly normal at this stage

ur fine they will be ok until u harvest them there just showing signs of finishing up.. get ready for the best part, good looking grow

Really this is normal? I thought leafs would start yellowing at the bottem of the pant not the top!!
Its been so long since I had a good crop like this I guess. Ever since I moved Its taken 7months to fix all my problems and issues.

Thanks a lot guys!! and yes the good part !!EVEN THOUGH I dont smoke, and I want to so bad, it looks and smells sooo good..

MY PARENTS LIED TO ME WHEN I WAS A KID!! AND I PROVED IT TO THEM!! THAT
MONEY DOES GROW ON TREES!!!!!!!!!!!!!