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I've grown two species of Tonina and Eriocaulon setaceum at Kh/GH 4/5 in Miami. It even grew, albeit slowly, with no CO2 and only 2 wpg. They grew well, although much better in the higher lighting and CO2 enriched conditions. I consider Miami's tapwater to be soft.

It didn't work out too well in KH/Gh 11/13, Chicago's water, though. The plant grew fine for a couple weeks before turning a transparent brown color. I consider Chicago's tapwater to be pretty hard. It's even harder in the winter.

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