What type of water are you using? What PH is the water? Did you over water?
I use tap water, I dechlorinate it by leaving uncovered for 24hrs, then I'll adjust the PH to the type of growing medium being used. Im using Canna terra and Bio bizz all mix and My water needs to be PH'D to 6.2 with or without feed in it. You have PH 7 on your charts and thats too high for coco and you'll get nutrients getting locked out in that ph range. I am a newbie on here but I have been an active grower in the past and have completed successful grows with canna coco. Any questions and I'll try to help.
I'm currently growing Autoflowers for the first time and I have had to do a lot more homework recently. Goodluck👍
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