High dosing 2 part


My 2 part dosing has been increasing way too much.
90 gal. mixed reef with 35 gal sump not heavy stocked
330 ml per day.
ph 8.2 to 8.4
mg 1300
heavy coralline algae but, I can't imagine that would take up that much 2 part.
I was struggling to keep the Ca up to 425. My Alk didn't seem to be an issue. I brought them both up together until my Ca stabilized.