180 gallon tanks water change

bigford

fish only
i figure between the tank's 150g the sump's 25'g and the fuge 15'g
how much water should i change in a weekly water change???
The LFS said no more then 20 gallons weekly this seems kinda low.
fish and live rock with feather duster and micro algae in the fuge
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20 gallons is fine as a weekly water change. However, remember about the displacement of water after the addition of the live rock.
 
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