We’re do you get your canna coco
Ebay it’s quite cheap
Thanks for the tag @JaneQP - my method is to soak it in the bathtub with a double dose of CalMag for a day. I’m an absolute hit with my wife. 
After that ordeal, I just buy Canna Coco. Last time I got some I think it was from some random online hydro shop.
Skip the washing and buffering from now on
I buy my coco from an Indoor Grow Supply in a nearby town. Buying it in the store is way way cheaper than having it shipped. Like half the price. I get the 3 pack of Grow!t bricks for 13 bucks. Filling a 5 gallon bucket with plain tap water and a dose of calmag I soak them for a day or two. Just whatever fits into my schedule. From there I scoop it into my grow bags and take it out and rinse it for a few minutes with the garden hose. Yes, the city water has chlorine, but I let the bags set for a few days anyway so its long gone by the time I get ready to use them. Last step is to water the bags with what the plants will get which is full strength Jacks 321. I use RO water for this step. Water till you get a decent run off. At least 25% out. Its now ready for plants. As long as you dont wait till the day you need it the process is fun and easy. I have used it just straight from the brick to grow bag and it did ok. I will see a calcium problem at about 8 to 10 weeks that wont go away but the plants finish. By buffering the issue is not a problem.
On the leaf discoloration, that looks like variegation. Its harmless genetics and usually goes away but can hang around in some plants. Sometimes its quite striking and cool looking.
Google “Cannabis Variegation” and look at some of the examples.
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