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In a proper filtered aquarium that is properly stocked and has completed the nitrogen cycle you should be doing 20% water changes once a week. In heavily planted and very lightly stocked tanks you may get away with once a fortnight. If you're keeping very messy fish such as Plecos or Goldfish then you may need to do twice a week!

In an unfiltered bowl you would need to do it several times a week, but no fish should be kept in an unfiltered aquarium unless you are following the Walstad Method, which is pretty complex and technical!

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