- that EC runoff is probably closer to a mid-bloom level...? so a bit overfed
- CO2 should match light/wind levels... hard to gauge the airflow... do all the leaves gently wiggle, or are you blasting them with a clip-on fan? (just dumb questions to consider)
- from the photo alone, i wonder: do you rotate the plants, or do they just sit in that configuration? if they don't move, a light-burn or lighting issue might be visually id'able... notice the leaves around the sides of the tent aren't quite as pale, but the center plant looks the worst?
that last observation would is passed to my fellow OGers...?
<-- wonders about IR/heat reflectivity of grow-tents & such