Yellowing leaves in veg dwc

I recently switched to dwc from soil. Leaves and most of the top of plants are turning bright yellow. Older momma is still green though. At the beginning of putting in mesh pots i was using 400watt mh but juat switched to 300watt led. Ph is at 6. I am using gro a+b also veg fortifier. Anyone have an idea on what this could be i am told calmag will fix this.

looks like a nitrogen or sulfur deficiency to me... calcium deficiency generally has more brown spotting.

you can always foliar spray amoniacal nitrogen, plants will only take in what they need without burning..

I am going to be adding nitrogen i spoke with a local grow shop and showed him pics etc. He says the same thing thank you.