How to do a water change a betta fish tank. Water changes ideally need to be done once a week. Filters should be cleaned every 4-6 weeks depending on the stocking level of the fish. When cleaning the filter it should be done in aquarium water otherwise the bacteria that lives in the sponge will be killed off. If you don’t have a filter in the tank 80-100% water changes should be done every 2-3 days.
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