The answers here will vary widely as the water volume, population density, filtration, aeration are all variables to be factored.
I gauge water changes by TDS and perform a water change once it breaches 200ppm.
The time in-between is 3 weeks in a 4 gallon to 2 months in a 20 gallon with a UGF... See what i mean?
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"I am Groot", the faithful protector