We've used CaRx's and Triton additives for a couple of years for four different reef tanks at my work. Works well. In between Triton ICP tests we add those elements that need to be adjusted, spread over 2-4 doses depending on the amount.
We've also used CaRx and Core7 together when the reactors themselves didn't keep up with the demand. Never had a problem with any element being too high because of that dosing. We're usually a bit low in B, K, Sr etc, but not much. So it's easily adjusted each element by themselves.
Iron, Iodine and Manganese we dose daily.