coco needs specific nutes that have more calcium or something like that because coco bind certain nutes up in the media. it was explained to me in the hydro store that this is for someone who is experienced in diagnosing plant issues involving nutes. i even tried telling them i have H&G coco nutes and they said they'd sell it to me but I would be back with frustration and questions. I'm a newbie that is still learning about all of this so I'm reserving coco for another time when i get bored with what I'm doing and want to change things up.
peat can give you similar growth if that's what you want. you just have to watch your soil ph and use lots of perlite for great drainage. Promix is highly popular and has mycos in it too.
i have started 2 plants in coco, theyre about 1.5 and 3 weeks old now on 12/12 from seed. I have been feeding them a very light dose of tomato feed and misting them with the same. Theyre doing well with no problems so far. We will see in the next few weeks how they get on in flower.