I was thinking to do that just to see if i can see a difference, would have to really....BUT...lol i think im gonna use it on all of them. Everyone ive spoken to has rated it so im confident enough to use it on all of them. Just wanna make sure im giving the correct dosage and useage. Im handwatering with coco, its not soil so guessing go with the hydro directions. Just wondering do you ec? it doesnt mention ec on there simply how many ml to add to the water. Im guessing though youll still have to ph after as thats what will affect the intake. Ill be using it from today for a week then flushing with water. Some say it acts a flusher aswell but ill rather give 2 waterings of plain water.