Only lower leaves?

So this is my problem... my plant has had cal/mag deficiency's (To be expected with coco)

For some reason though it has only affected some of the lower leaves and minorly affected the upper leaves... Its been happening for weeks but its been increasing

I recently started feeding it CaliMagic About an 1/8 of a tsp..

Coco/perlite/ flora Nova series

6.0 Ph/ t5 6400k veg

Please experienced opinions..
 

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That's a pretty dark plant brosef unless the light is off a bit. Back off the N if it's really that dark. Are you flushing once a week? In coco salt buildup will happen fast since it's like hydro and the salts don't absorb into the coco almost at all.
 
Check the calibration on your pH meter then, because that's pH issues and a lockout of some sort maybe a micromineral or intermittent, who knows. Somethings up.
 
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