Yellowing at top of plant

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Critical Jack
Hey guys just looking for some opinions one of my plants is yellow on top with fading between veins like magnesium deficiency. I could possibly have had light too close to the top in fact I'm fairly sure this is the case. Generally how long does it take top to plant to green up again after light stress?

The environment has been spot on but I could possibly have been underfeeding a little and think could deficient in nitrogen but leaves aren't yellowing from the bottom up so not too sure about this. Watering practices have been fine pots drying out in 2 days in 15l airpots and plants don't seem to be slowed down.

I have plants in allmix biobizz soil and didn't feed for nearly 3 weeks after last transplant so this could have caused a bit of a deficiency. Plants have just been flipped to flower a few days ago after 7 weeks veg.
 

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Plants look fine but the right one could use some grow nutes and cal/mag.
 
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