Sick Plants, someone help please.

Hello,

I'm growing 6 plants in a DWC system, using Scrog. 3 Trainwreck and 3 cheese, all from Greenhouse Seed Company.
I'm using a 4 x 8ft tent with 2 600w air cooled that are about 8 inches from the plants. Lights currently with MH bulbs.
780cfm exhaust fan pulling air through a carbon filter over the lights and out and into another room. Passive intake.
3 oscillating fans.
This is my first DWC grow and first Scrog attempt. Plant are growing but have been experiencing problems from the start of Veg with both strains.
Looks like a deficiency but not really sure what.
Using GH micro and bloom 8/16 Lucas Formula for the first time with Europonics Fossilfuel humic acids, Great White and Superthrive. Put the screen (2inch chicken wire) in 4 days ago.

PH 5.8
PPM around 800
Temps between 76 and 80 at canopy
humidity sits between 30% and 40%
2 weeks seedling, Day 18 of veg




These 2 are from a day 14 of veg