Water change

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luca09

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How much tank water can be changed at any one time? This seems to vary (depending on the website) anywhere from 10% - 25% of the total volume.
How often should the water be changed?
 
well it kinda depends on filter/tank/bio load. i recomend getting a test kit. that way you can see the levels of nitrate rise in your tank. i dont remember the exact ppm. but a lot of people do 20% water change ever other week. im sure someone will chime in with exact numbers.
 
The best answer is: it depends.

You should change enough water to bring your water parameters within normal levels. This could be as little as 10% or as much as 25%. The best way to tell is to test your water with a liquid reagent test kit.
 
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