If your water parameters are all good, why would you have to add any chemicals at all initially. I owuld take readings of my waters parameters first and get a good record going after you introduce corals etc, and see how the levels alter, and add what is being utilized to bring it back within the ideal range...Read the labels on the containers of anything you plan to add, and if it does not list exactly what the contents are in it, don;t buy it or add it, as you will not know what to check the levels for........and do not add anything that you can not run tests for either.....YOu can take a series of tests over say a weeks time and see if it stays within the ideal range.......then do it on a 2x a month basis........get an average of how much is used up of whatever supplement, and divide that number by the days you ran the tests, and thats how much is utilized on a daily basis, so thats what would have to be added roughly on a daily basis to keep it in the required range.......IMHO thats the safest way to add supplements and not by recomended set amouts which may or may not work for you......Why add more if its not being utilized........
My one tank has been up for some time now and I am not just getting lower calcium readings so thats all I add and adjust my alk if needed...........everything is growing just fine and looks super.....