I have a bunch of corals and I test for the following: ammonia, trites, trates, hi ph, phosphates, alkalinity, magnesium & calcium. When I was doing my weekly water changes I didn't have any drops any parameters, BUT I have recently switched my 125g to every two or three weeks for water changes. I also have about 30 corals in the tank, some large ones. In my opinion, most likely you will not have to dose anything if you keep up with the water changes.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.