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You likely don't fill your fish tank right to the rim either. The larger your tank the more volume you lose with water level an inch or 2 below the rim. No voodoo here, sand, rock, ovreflows all displace water volume.
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Mike 77g sumpless SW DIY 10 watt multi-chip LED build http://www.canreef.com/vbulletin/showthread.php?t=82206 Last edited by mike31154; 06-03-2018 at 03:30 PM. |