Aeon,
Are you planning to use CaCO3 to increase Ca content in water column? CaCO3 is not as soluble (water turns milky) as KNO3 or K2HPO4. I have some spare CaCO3 in powder form. You can have it if you want.
Increasing Ca in substrate can easily be achieved by using Wonder-Gro root+ tablets. I had stopped dosing Seachem Equilibrium (coming to 3 weeks). So far, my plants are not showing any sign of Ca deficiency .
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