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It reduces PH (which I am struggling to keep high enough. I just hit 8.3 today.. for the first time ever) It also reduces Alk, which I dose for. I gotta think about this one : )Phosphat-e, aka lanthanum Chloride. Search on this website for proper precautions.
Do not dose, imo, only apply if phosphate is over 0.4 to 0.6. Do not use below 0.2.
And refugium.
Try to find source, reef roids are heavy contributor.