I assume you mean - should you kick up the dirt from your dirted tank during a W/C, does it do more harm than good? Ideally, the 'dirt' should be well capped and shouldn't easily 'come up'. If it is a problem, do a w/c without cleaning the substrate. My large tank is so packed with plants ( or itwas ) that I can't get at the substrate, a little dirty but w/e.
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