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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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13y ago
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12y ago

if used in recommended dose it should not affect the fish in the tank. These products are normally made fish safe for use in the aquarium. That said, a tank is normally worse off being too clean rather than too dirty.

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Q: How long after cleaning a fish tank can you use algae cleaner?
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