Hi Matt,
I don't personally do water changes when cycling as I think it slows the cycle down. However, I don't think it will hurt anything. You are testing the water but the bacteria that drives the cycle lives in the sand & rock not the water. The ammonia, etc is consumed by the bacteria and converted to the next product in the cycle. Ie ammonia to nitrite to nitrate to nitrogen gas. Do you have any critters in your tank?
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