This, it's a eco system and if it runs its own course. Regular water changes is more than enough to keep it healthy and productive as long as the filters flow is good. There are many fish keepers who clean canisters once a year and they dont encounter any problems. Been doing this since the mid 90's when canisters were just coming out.Cleaning it too often will kill all the good bacteria. I do all my canisters once a year using aquarium water
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