I absolutely agree with the importance of knowing the pH level of the dealer's stock tank that your new fish was taken from, But to get the correct data from the store you will need to have them test in front of you at the time of purchase since any answer they rattle off when you ask will most probably inaccurate due to the changing conditions in most stores crowded tanks." Spot-Cleaning" and water changes are usually being done on an ongoing basis, so the data anybody repeats from memory is usually outdated.
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