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Diagnosis help. Calcium deficiency?

Hello all. Help here is appreciated, relevant info below. Yellowing started on lower leaves only about 3 days ago and is progressively getting worse and going up the plant. What can I do to nurse these girls back to fill health? Just trying to get them healthy before I flip to flower.

3 gal fox farm ocean forest(yes I know next time fill it more to the top of the pot)

General hydroponics nutrients in amounts as listed on bottle, every other watering.

5ml/gal of CalMag at every watering

Runoff pH is normal.

They are 6 weeks old

6 comments

Comments (6)

Mr. Grow It

Jun 09, 2021

What is your soil runoff pH and PPM? Also, what grow light are you using and how far away is it from the top of the plant?

Mr. Grow It

Jun 11, 2021

Replying to

@Tony Snow Some may go in a different direction that me, but I'd water in at 6.5-6.8 pH and hope it drifts up to the ideal range. If the problem doesn't get better in the mater of about 10 days, then I'd flush.