You may want to check you kdh and calcium level before dosing. My initiate error was dosing kalk without checking and my tank calcium level shoot to more than 500mg/l.
Btw, I have a 3.5ft tank and I dose them drop by drop at a speed of ~1 drop per sec during nite. If you do not have many corals in you nano, it may not be necessary to dose, imo.
Cheers