Planted Tank Guru
Join Date: Apr 2011
Location: Hamilton, Ontario, Canada
First, any kind of rock can affect pH depending on what its made of. Second, if you're not adding something back to your RO water, then it can affect the pH. What I did is mix a bit of distilled water with my tap water to lower the TDS without having to add anything back to it at all. Maybe try doing a mix of treated, aged tap water with RO water and see how that affects your pH. Also, are you testing the pH of the RO water before hand to make sure its actually good. Some of the cheaper fill-it-yourself RO water places don't change their media that often and sometimes they don't end up doing that much at all to the water you're buying.
20g platy, , 2 x 10g shrimp, 3 x 20g shrimp, 7.5g shrimp and 1 great dane/mastiff puppy.
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