I keep my mag at about 1350-1400 and calcium at 450 in non macro tanks. Those are dosed, as it is consumed quickly.
The macro tank gets IO base numbers when mixed to 1.026. So 1250-1300 mag and 420-430 calcium. The coraline eats that and up slowly, but I do water changes on the macro tank to replenish some trace elements. Other elements come from CheatoGro. Still tweaking the dosing on that. I also dose pure ammonia and no3. As well a little skimmate here and there.
I try to keep nutrients around 10 and .1 in my mixed reefs and then around 5 and .03 in the macro tank. If numbers stay there for the macro tank, almost no gha grows.
All tanks stay at 9 for alk and besides nutrients are very close everywhere else for parameters.
Never know when an issue will occur and you have to move everything to another tank in a hurry. Thanks merten that decided to push a guard off the gyre lol.