Ph and Ppm's is crucial in coco to hit the its sweet spot for Ph is in between 5.5 - 6.5 Always check your run off if goes in at 5.5 it shouldn't come out at higher than 6.5 and your Ppm's shouldn't be higher than 1100 if it does run Ph 5.5 water thru it until the run off is 6.2 and make sure that your Ppm's stay around 1000 coco is the way to go much luck brotherright then i know that we an use any nutes in coco..
and i know that cal-mag is a must..
but what i dunno is! is ph'ing a must???
i'm runnin soil atm and dont check ph cos i'm a if it aint broke kinda guy lol
just something i have'nt been able to get an answer to