Hi there mate
Yes you can start using your Coco A+B as of now but at 1/2 strength and keep your ph at around 6
Don't over do it with the feeding Remember less is best until you get the hang of it
Good luck with the RQS Cheese 😁
Hi! Yes it is. Coco itself does not have any nutrients in it so everything must be introduced. Also essential for coco growing is to get your PH right
Happy growing!