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COCO COIR Why are my leaves turning yellow

BL7995

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https://imgur.com/a/YtKyzm4

These plants are about 6 weeks old now, but for the past 2 weeks the leaves have been turning yellow.
I’m still pretty new to growing and I’ve tried reading up on what the problem could be, but I’m not having much luck.

I’m using coco coir and perlite as the medium and cana coco for nutrients. I’ve been really careful to only water them when the top inch or two of coco dries out. Initially I was mixing nutrients in with every other watering, but that’s when the leaves started to turn yellow. I reduced the frequency that I add in nutrients, but I’m still not seeing any improvement.

From what I’ve read, it seems like I’m either not giving them enough nutrients, or I’m giving them too much. I could really use some advice.
 
Agree but you don't mention pH? It is essential in coco/perl to keep between 5.5 to 6.5 and to vary a bit in that range for proper nute uptake. Any higher or lower will give you issues.
 
FWIW, I just use Nebula Hazes' Coco-coir feeding schedule. Just go to GWE and ferret it out. You'll be glad you did!
 

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