Best bit of advice i can give is that if you cant or dont test for it dont dose it. Personally I use the red sea additives in my reef to keep my calcium, alkalinity, amd magnesium where they should be and have had really good luck so far. The best thing to do is try to figure out how much of each of those that you burn through a day by testing daily for a week or 2 and then start to dose a little at a time until you figure out how much you will need to add daily to keep your levels steady because the more stable your parameters are the better your corals will look and grow.