classic nitrogen deficiency?

so i'm using pre-nute'd soil and kinda lost track of when they were supposed to run out...bah. haha but they're just my veg babies haven't been looking over them that well noticed a bit of yellowing and now it's gone full fledged with the two WW, everybody else is looking alright the couple smaller ones aren't as healthy as i would like.

my first bump

i had N deficiency but it was just a pale green/yellowing of all leaves evenly. I think generally when the lower leaves yellow/die off like that it's because they are being cannibalized by the plant to feed the upper leaves with more light exposure.

i could be wrong because i'm an amateur but i think i'm right.

give it some N and if it starts to show improvement in a day or two you know that was the problem.

i have MG just gave a light dose of that. 8.7.6. should clear up fine