01-21-2012, 03:50 PM
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I would get some live plants in that tank. Plants can take up many toxins and would probably help with this water. I would also boil what goes in the tank if you are being told to boil the water for domestic use or drinking. Acceptable levels of many metals and substances that are safe for humans can be quite the opposite for fish. Alternatively, use RO, distilled or rainwater but the tap water mixed with whichever should still be boiled. RO or distilled on its own is not good as it is too pure to support life; rainwater alone would be OK if you had any and assuming no pollutant source in the area.
On the hardness issue, diluting with RO, distilled or rainwater is again the best way to go. But be careful, as mollies need hard water. Commercially-raised angelfish can manage in medium hard basic (pH in low to mid-7's) water, and this is as soft and low (pH) as it should be for mollies. They develop health issues in soft or acidic water and rarely live long.