plants levees turning yellow any ideas?

its big budda critical, its been going good i scrog it and its be in its about 70 days and it a auto, it could be natral, but the buds are not fatting up like the should
its in 120 cfl
r]i feed it only dyna-grow in hydro water farm , its always works before, maybe needs more pots. i dont know heres some pics let me know if any has idea like cal-mag or just ending its life cycle.

thanks in advance

sorry pics are not the best since i cant move it due tp the scrog

It doesn't look bad by any means. Doesn't jump out to me and say one thing or another. Possible heat stress is all I can see. Get rid of the low intensity lighting and get an hps and then those buds would be huge.