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Posted by Marc Levenson on May 25, 2005, 1:02 pm
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A general rule is 25% of the tank volume per month. If you
have a 50g tank, 25% of 50g would be changed.
There are lots of ways of accomplishing this task, and some
change more while others change less, or do so more
frequently or less frequently. The important thing is water
quality, and a good routine tends to achieve successful results.
Marc
BigHaig@feet.com wrote:
> So it is suggested to do a water change of about 20-25% every few weeks (3-4
> weeks). Is this 25% of the tank? or 25% of water in the tank after
> evaporation?
>
> So I have a 50 gallon tank, is that a water change of 12.5 gallons? Or from
> the 40 gallons (after 10 gallons have evaporated) a 20% water change (10
> gallons evaporate + 10-12% of tank)?
>
> Thanks
>
>
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> weeks). Is this 25% of the tank? or 25% of water in the tank after
> evaporation?
>
> So I have a 50 gallon tank, is that a water change of 12.5 gallons? Or from
> the 40 gallons (after 10 gallons have evaporated) a 20% water change (10
> gallons evaporate + 10-12% of tank)?
>
> Thanks
>
>