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"<p>The frequency of tank cleaning depends on the tank's size and whether it is equipped with a filter. Tanks with a capacity of less than 2.5 gallons and without a filter should be avoided, as a minimum of 5 gallons is recommended. Such tanks require cleaning  to four times a week, with 80-100% water change. If the tank has a filter, it should be cleaned weekly, with 25-30% water change and substrate vacuuming. It is crucial to clean the filter once a month using aquarium water to prevent killing the beneficial bacteria that has accumulated in it. Tank maintenance may vary depending on the number of fish and live plants in the tank, but generally, weekly water changes are recommended.</p>"
<https://thailandbettafish.com/en-ph/products/rare-veiltail-koi-betta-fish-1>