PLS HELP!!!!!!!Diesel fem &amnaesia haze auto .this is my first grow in coco

Plant growth is not affected.new leaves are growing and popping in the top but the lower leaves are turning yellow and dying..what could be the cause??..i overwatered the medium in the beginning but i reduced it.

What mix are you using, have you fed them nutes little more info on what you have done to them so far will help people diagnose for you

leaves are turning yellow only after i transplanted it in big pots
medium:coco peat+perlite+vermiculite
nutrients:GH trio series +rapid start
ppm:100ppm
ph:7.5 (norma driking water)
ppm for the seedlings -50ppm (only rapid start)
light-MH400watts
And for the seedlings i added bonemeal,neemcake to the medium.
my first grow was in hydro and i had a perputual harvest...pls help me guys.thanks in advance.

You can write this one off, looks weird.
These plants are very sick because of major N def, 100ppm is not working not even close.
You need need to jack up the nutes x5 and hope and pray the sick little fuckers can recover.