You do not need to dose anything, a weekly water of say 10% will replenish the elements.
You will start to dose when testing indicates your CA, ALK and MG are being used up faster by the corals than a water change can keep up with.
When this time comes, daily dosing by hand is fine using a 2-part solution along with Magnisium.
You can also dose NOPox daily manually if you need to increase your bacteria population