i use promix/ffof 50-50 and add more perlite,when i had mine in solo cup i had it in happy frog they loved it ,when roots came out the bottom of the cup i planted in 3 gallon pot with the promix and fox farm ocean forest ,put a little root magic in the hole placed plant in and watered in ,been using blue planet nutrients and having a hell of a time with them .i think i got it right now-using 1/4 strength nutes -1 ml silica -2 ml cal mag -1 tsp black strap mollasses and only feeding once a week ,the are happy happy happy .i don't really care for the coco there is no vitamins nutreients are nothing in it and you will have to feed every other watering ,but anyway once the root comes out bottom of cup step up to what ever pots your gonna use ,just remember less is best with your nutrient and N P K is important ,don't stress the small stuff dude those plant will talk to you when they are angry ,you can hang man, good luck