Riko, welcome..........if you are PH down mode with your tap water post adding nute. use canna PH down in veg, as it's nitric acid and not phos down which you use in flower. You can burn em in veg with flower phos ph down !!.........they dont mind the nitric acid ph down as it's N and there in veg Riko !!........hope this helps budder.............good luck with em though. Alway's aierate yor res after adding nute airate just befor feed for half hour. halia silent 35ltr/min and koi direct tube micro defuser works best and silent. AB