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Unread 03/19/2013, 12:49 PM   #19
jmadison
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Join Date: Mar 2008
Location: PHX, AZ
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Quote:
Originally Posted by saltwater2999 View Post
when you say large water change how much would that be . like I said I have a 55gallon tank with a 20 gallon sump
25-30 gallons.

Remember you don't have 75 gallons of water in your system. It's likely to be more like 50-55 depending on rock, plumbing length, and sump water level.


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