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Originally Posted by Ozymandias
Good to here it confirmed, it's strange but i rarely (or at least i don't remember) reading that about water hardness and plants much.
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That's b/c it takes a long time to happen, and in most tanks PWC replace whatever TDS are removed by the plants. Natural Planted Tanks don't use PWC, though, so kH must be supplemented since eventually the plants will use up all the carbonates in the water.