Definitely don't add buffering chemicals for the purpose of chasing pH. Any clue what your alk looks like? Do you do your water changes on the weekends and see your pH drop throughout the week? If you can determine that alk is dropping to levels which are too low by the end of the week then it may be of value to supplement alk in topoff with kalkwasser or other means. But I wouldn't recommend blindly boosting alk as a response to low pH.
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