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Water pump does nothing for the aquarium.

Aquarium filter on the other hand, does biological filtration for the tank.

You need to understand the natural behind having a filter in the tank. It is for nitrogen cycle. Fish produce ammonia as waste, and some beneficial bacteria feed on ammonia will colonize the filter media. They convert ammonia into nitrite, then convert nitrite into nitrate.

Ammonia and nitrite are both toxic. Nitrate is relatively harmless at low concentration, yet it can crash the PH and lower fish immune system if the concentration is too high.

For a well maintained aquarium, we do partial water change of 30~50% once a week in order to keep nitrate in check, as well as to restore water buffer and minerals.

To understand this better, you need to learn more about aquarium nitrogen cycle.

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Q: Do you need to change the water in a fish pond?
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