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  1. baron von bubba

    Evaporation?

    hi, i have a 240l open top tank and at the moment its probably losing around 10l's a week to evaporation. i'm wandering if i should be using RO water to top up? as if i top up with tap water or just wait and refill at next water change, wont the gh and kh steadily increase? my tap water is...
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