I never grew in coco, have no opinion, coco has no nutritional value it is used as a hydroponic growing medium.
Instead of buying overpriced brand name highly touted "super duper organic mixes" get this:
1. They are all based on Canadian peat moss as main ingredient with various ammendments.
2. You can buy canadian peat moss in US for about $10.00 for 3 cu feet (about 60 liters)
3. Then you can add some perlite, sand, organic shit like worm castings or compost, not necessary but highly benefitial. Egg shells, lime, wood ashes (lime mandatory to lup PH a bit). Then you get a mix as good or better than all those 80$ per bag commercial super duper hiper organic ( organic my ass, peat moss is 100% organic in the first place).
4. How many times you heard that: "Peat moss is a not renuvable or environmently friendly source. Bull shit, Canada has more peat moss than they can ever sell. Peat moss is the best organic, antipathogen, antifungus medium there is, it just needs some other ingredients to lower PH a bit and make it more airy.
5. That's what they all do (greedy growing mix companies, taking advantage of inexperienced gardeners. They put down and trash peat moss while using it as the main ingrediend in their overpriced "miraculous" mixes . FUCKEN PATHETIC.
6. There is no better and affordable basic 100% organic ingredient like peat moss, it is up to you to build a mix based on it for dime on a $ they charge for their product.
Get a bag of peat moss, wet it down, add 30% or more perlite or sand, dolomitic lime, some bone meal. Thats a minimum, but it is enough to equal or better overpriced commercial mixes, then if you can add some wood ashes (potash) and perhaps some worm castings, kelp, and whatever, your fricken mix is a way above all commercial mixes I don't care if they charge $100 a bag or more, your fricken mix is way above their shit.