If possible, avoid dropping PO4 by more than .05 ppm daily if SPS in the system. Definitely no more than .08. I know you can and people do it, but It’s just too much of a swing/ destabilizing event. Not healthy for the tank.
IMO, reefers should avoid dosing Lanthanum Chloride in 2024. Why? Because you can accomplish the same result with the amazing equipment we have today, controlled feeding, natural bacteria, and utilizing a carbon source. Not only will you be feeding the system, but you’ll be promoting stability. Lanthanum is a pollutant that’s likely to build up over time, and isn’t healthy for the corals.