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Old 08/24/2019, 10:05 PM   #6
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Join Date: Feb 2010
Posts: 196
A standard 90 gallon will be fine, I am building a 75 gallon sump for my 315 (7X2X3). I tried to snag a 125 to build my sump out of but the other guy was faster. I was planning on making part of it an auto top off reservoir anyway, so now it will just be a 29 gallon tank sitting next to the 75. Besides, 75's are CHEAP. Premade sumps are expensive and most rated for 300+ gallons are less than 75 gallons anyway. Like you I am also glad to have the extra room for equipment.

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