Is this Calcium deficiency?

[Ja]

I have a bubble auto growing in coco at about 6 weeks and some of the leaves are spotting and brown as per the photo.
I have increased my cal/mag (x2) and my ph level is at 6 (last feed yesterday) It seems to have worsened over night, but I’m not sure how long it will take to recover?
Please help.

[blackthumbbetty]

I’m going to suggest Potassium, especially with the Coco. Could be Magnesium, but I’m putting my money on Potassium.

Calcium def would be focused on the newer growth.

[swampdollar]

Hey everyone. Please Give me some help with these. Its my first grow and im trying to find out why the new growth looks like this? Its GSCX AF 3 weeks old. Fox Farm soil outdoor grow