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#2
05-01-2012, 06:25 PM
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The head loss calculator and overflow size calculator on RC are really valuable for figuring this sort of thing out rather than by trial and error.
http://reefcentral.com/index.php/head-loss-calculator http://reefcentral.com/index.php/dra...flow-size-calc The overflow size calculator recommends a 2-1/4" hole for 3000gph. My own tank runs a Dart from which I get about 2300gph after head loss. My overflow is 2" but I have it dialled back slightly so that it sucks less air and makes less noise. I used to have a 1-1/2" bulkhead and when I did I had to dial back the pump because the drain couldn't keep up.
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"We shall dive down through black abysses... and in that lair of the Deep Ones we shall dwell amidst wonder and glory forever." - H.P. Lovecraft Old 120gal Tank Journal New 225gal Tank Journal May 2010 TOTM The 10th Annual Prince George Reef Tank Tour Last edited by whatcaneyedo; 05-01-2012 at 06:28 PM. 
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