Unless we decide to breed very seriously with rare fish, we should not concern ourselves with the water PH.
Water that has remained quite untouched is likely to give different PH readings at different times of the day because interaction of the chemicals contained in it is always taking place. Further, one pint of water of PH 6.5 mixed with an equal quantity of PH 7.5 does not necessarily give a reading of PH 7.0 because one water may be 'buffered'. 'Buffered' water has a high mineral content and the influence of all these dissolved solids has to be overcome before there is an alteration in the PH reading. Tap water and rainwater are not usually 'buffered'.
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