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i do my weekly water changes with a gravel vac but just curious on why we need to do water changes. after a tank is cycled ammonia and nitrite are 0 which leves nitrate for plants
Google "Old Tank Syndrome". Water changes are about a lot more than nitrAtes and cleanliness. TDS (total dissolved solids) build up is a big issue as well as the need to restore nutrients and also buffers which hold ph steady.