Which fox farm trio nutrients will help my wwauto

Only 1 of 3 is doing this. Mostly only on the older leaves. I gave them all some cal-mag and about to start tiger bloom next watering. Will it fix this stuff from getting worse?

This:

It looks like nitrogen deficiency on top of magnesium deficiency to me

That was my first auto grow and boy i think i made every noob mistake there is. Despite all my efforts, I still got an ok(if not pretty) harvest. A years learning has helped. Im getting more off 1 plant now than i did from 4 then. The lesson learned? Dont stop trying and learn from your failures. You never get better if you dont grow.