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Same questions being asked and answered repeatedly
I agree that there's no cause for a water change, but if it makes you happy to do one, it won't hurt anything.
The nitrate value is not real. It is caused by interference by the nitrite. You may have 4 ppm nitrite and zero ppm nitrate.
Not sure what you are saying, but I agree with the assertion that a water change won’t have much impact on aquarium cycling through loss of bacteria.