Some good overall advice for beginners is don't dose anything, period. Regular partial water changes will suffice until you have a fair bit of growth with corals that consume calcium. Currently you have nothing in your tank that requires dosing.
A good salt mix will give you enough of Ca and alk, and if you want a bit higher Ca, dose a Ca product into your make up water before doing the water change.
For your current needs, keep Ca above 380ppm (but under 420ish), alk above 7dKh. Do a 10% water change every 2 weeks and you're laughing!
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Brad
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