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Starting from near-zero dissolved solids means you can build exactly the mineral profile your fish and plants need, rather than fighting against whatever the tap water delivers. mineral replacement for water is that near-zero is not where you want to stay. Why RO Water Needs Remineralization for Aquarium Use Water that is too soft, meaning too low in dissolved minerals, stresses fish and inhibits plant growth. The specific mineral requirements vary by species. Remineralizing ro water for aquarium use means building a mineral profile matched to the species you are keeping, rather than applying a general drinking water target. The Two Hardness Values That Matter Aquarium water hardness is measured in two ways: GH and KH. For freshwater planted tanks, a GH of 4 to 8 dGH is a common target, equivalent to roughly 70 to 140 ppm. A KH of at least 2 to 3 dGH provides enough buffering to prevent pH crashes, which are more dangerous to fish than low mineral content. Methods for Adding Minerals to RO Water for Fish Tanks Follow the manufacturer's dosing instructions and verify with a GH test kit before adding the water to the tank. Seachem Equilibrium is a commonly used option for planted freshwater tanks. Mix the remineralizer with a measured volume of RO water, test the GH and KH of the resulting mix, and adjust before adding it to the tank. ro filter with remineralization on Planted Tanks Calcium and magnesium are required for plant cell structure and chlorophyll production. Remineralizing ro water for aquarium planted tanks should include a formulation that lists calcium and magnesium specifically.