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The acidity of your tank water can kill your fish or make them sick. Before deciding on what fish you want to put in your tank; you should ask your local pet-store what kind of water the fish prefere. Some fish like hard water (high acid) and some fish like really soft water (low acid). Most fish at the pet store will be happy in moderately acidic to soft water. I keep my tank at 7.0 on the pH scale.

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16y ago

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