Lightening of the leaves

PJ Diaz said:

Canna AB is specifically made for coco grows. Why would you need to add calmag?

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This is what i was taught and its always worked for me. If u can eliminate a potential issue before one starts it's always best.
Once u see red lines on stalk and red stems what do u think it is? Or what should he do? Is that not a obvious sign? If u run tap water then calmag may not be needed or u got a strain that's gd without it then I'd let it ride.

Grow Monster said:

Why & How to Use CalMag in Coco - Cal Mag Deficiency - Coco For Cannabis

Learn why you need additional Cal/Mag when growing in coco coir. Covers the role of cation exchange & offers simple instructions to avoid Cal/Mag problems

www.cocoforcannabis.com

This is what i was taught and its always worked for me. If u can eliminate a potential issue before one starts it's always best.
Once u see red lines on stalk and red stems what do u think it is? Or what should he do? Is that not a obvious sign? If u run tap water then calmag may not be needed or u got a strain that's gd without it then I'd let it ride.

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Sure for some nute lines you may need to add calmag when growing in coco, but not something like Canna Coco AB which is specifically formulated with coco grows in mind. I run Jacks 321 right now, which also has plenty of calcium and mag, so no need to run a calmag additive. As far as what the OP should do, I'd increase the AB to 1.2 EC and forget the calmag. Don't forget that most calmag has a lot of N in it too.

curious2garden said:

What else is mixed with the coco?

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Clay pebbles if that’s the correct name for them