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Discussion Starter · #1 ·
I live in AZ (US) and the tap water there is very hard. Tds was above 800. Of course I don't know what's in there, probably Ca and Mg mostly. I was scared so I used half RO half tap for my first tank. I'm getting tired of RO now, so I'm thinking about using tap, but not sure if this will affect fish and plants. My fish are mostly from South America. Plants are java fern, sprite, crypt, anubias, amz sword,...

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