I read somewhere in this forum that coco has higher levels of p and k in it, and that coco specific nutes are specifically made with lower levels of p and k. If this is true, then why do some of you add pk 13/14 when theres supposedly already enough pre-existing pk in the coco? Also, im a little confused on some other things: Cal-mag is not to be used with hard water right? And what is the difference between liquid karma and botanicare sweet, are they to be used together or does the karma already have the elements that sweet does? probly stupid questions but ive only ever just used flora nova grow and bloom and nothin else, so any help with nutrient/ supplement advice is greatly appreciated!! thx