My understanding is coco will add some micro nutrients and remove others. So the canna coco has a slightly diffrent balance of micro nutrients. Although as long as there is not too much or too little maybe micro nutrients do not matter that much.

Also who uses H2O2 with coco? Up to now I use beneficial fungi. My plants look nice but I fight with the PH every day. I lower it to 5.8 in the evening and it is 6.3 by the next day. So I lower it again. I am not sure if maybe the beneficial fungi raise the PH like pathogens do? I was thinking of using some h2o2 in my res. Maybe I should leave it alone and keep adding PH down.