Dusty if this is your first grow just keep it as simple as possible so just use the grow and bloom of your choice nothing else unless other factors cause you to have to add Cal Mag (RO water not necessarily just use tap and you wont have to add Cal Mag) . If this is your first grow you do not need any of the headaches messing around adding shit that you don't need you will be kept busy just keeping everything going smoothly. DO your research on RW it only needs to be flooded 1 time a day and depending on the stage of your plant 2 at most so you need to be up to speed. Keep it simple man until you have one under your belt and then you will have more confidence to add some stuff if you wish.