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I've used Equilibrium on RO only tanks for years and it works VERY well. Three tablespoons of the stuff per 50% WC on an 80g tank reconstituted the water and made the plants very happy. There are other chemical reconstituents available, but none of the other options provided Ca, Mg, and K in the quantities Equilibrium does. I even use it on my tanks at home that get tap water.

If you're adding Magnesium, Calcium, and Potassium in quantities sufficient for the plants you're already re-constituting your water. Adding some form of carbonate or bicarbonate is all you really need to do as a pH buffer with CO2 supplimentation.

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