The first time I grew in coco I used sunshine#4 and it worked out great but was very expensive, so now I make my own using all organic amendments obviously. My recipe is something like this high quality brick of coco, worm castings, sea kelp, course perlite, mykos. That's the basic blend from there u can add lots of different amendments right now I'm experimenting with Vegan nutes mixed in with my coco so far so good