I just started dosing recently and I pretty much have a full tank of corals, including some sps
. It took months of stocking them to finally see a decrease in my calcium and alkalinity on a daily basis.
I would just stock as you want and test occasionally to see if there is any depletion. You for sure dont want to start messing with dosing if it's not actually needed right off.
Find out what salt mix your lfs
uses for their water, I'm sure they will tell you.
I just use I/O reef crystals right now but have been thinking of switching to Red sea as I hear it has more calcium, kh
and magnesium in it and those are the elements that go down with corals using them.
Hope that helps some.