i use earth nectar/ambrosia. i pulled out all the roots i could see and put my coco in trash bags until i use it again. i don't see any reason to add any more. when i use new coco i put it in my 5 gal. containers and run 15 gallons of not ph'd r/o water through it. when i transplant into the 5 gal. containers, i feed thoroughly with ph'd feed. i haven't seen any adverse affects. i'm just to lazy to ph that much water. i mean shit that's almost 100 gallons! looks like my laziness paid off.