How often should I change the water in a fish tank with a filter after?
Margaux Lelievre
2025-09-05 13:26:51
Nombre de réponses
: 16
The frequency of water changes should be based around the nitrate level in the water.
Start with a routine of a 25% water change every two weeks.
If that keeps the nitrate level low, stick to the regime or you can even replace slightly less.
If nitrate levels still climb, you need to change more water at a time, like 30%, or more frequently, like weekly.
If you dechlorinate properly and always bring water to the same temperature, there is actually no limit on how often you can change the water.
Professional fish breeders may change water daily in order to remove excess food and encourage maximum growth.
Never remove all of the tank water in a water change, and little and often is best.
Set yourself a regime and stick to it.
But if you don’t change the water often enough the nitrate level will rise, pH and KH will drop, and you’ll get something called Old Tank Syndrome, whereby pH drops so low the biological filter stops working properly, your hardy fish just about survive it but newly purchased fish die within hours or days of being added.
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