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If your tap water is high pH then water changes will do no good. If your source water is lower than the tank then it will. But then you need to figure out why the tank water is so high.

I can see one problem. When you top off a tank with tap water you will cause the water in the tank to get harder and harder. The water evaporates and leaves behind the minerals. You and more water and the same thing happens.
 
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