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It all depends on the "bio-load" of your tank - Bio-Load is the waste created by the fish and waste removed by the good bacteria in your filter.

If there is only a small amount of fish producing waste you should be safe with a fortnightly gravel vac

If there is a heavy bio-load (10-15 fish) you should be doing part water changes and vacs weekly.

All depends on what waste is produced and removed.

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15y ago

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