Leaf curling on edges

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My hay like harvest from earlier this year
Problem: a couple of leaf edges are curling
Water: 6.3 to 6.5 pH, using local organic shop house blend "custom grow" nutrients every other watering
Light: Viparspectra 600w LED
Soil: Fox Farms Coco Loco, with added perlite
Temps: upper 60's to upper 80's
Humidity: anywhere from mid 40's to mid 60's
Grow area: outdoor in a shed, using a space heater during the cool nights, and a little fan to move air around. Nothing to control humidity
 

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Lower your ph to 6 or lower when feeding and give her a shot of cal/mag twice a week.That total yellow plant might not make it.
 
Lower your ph to 6 or lower when feeding and give her a shot of cal/mag twice a week.That total yellow plant might not make it.

Ok thank you for the suggestion. I will lower my pH to 6 moving forward. I picked up some cal mag a few days ago and have already used some on her.
 
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