Early on even with some coral water change can be enough but if you do the math wou will still have to dose to bring things back to nominal so it would just be minimal dosing. Probably not enough to utilize a dose. My opinion is never dose without testing. From my own experience I try to make my tank the best I can for my corals and hope I can do better by adding this and that and only wind up slowing down progress of my tank. My dt has a good bit of coral and I have to dose only 3ml of all for reef a day. My frag tank I only have to dose maybe once a week.