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· Premium Member
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Mollies have no issues even with "off the scale" hard water and high pH. Whatever her problems were, I don't think the water was the culprit. Probably injury from the first pregnancy or disease attacking her while she was weakened. If her belly was sunken in rather than rounded, you should treat the surviving fish for internal parasites.

You should never put a fish in straight distilled or RO water, but you can use it to dilute tap water that has more minerals than you want.

I don't think you should even consider changing your water unless you are going to also change fish.
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