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I personally don't believe that there should be any issue in regards to the amount of flow for a return pump from a sump. Essentially the water in the sump should be regarded as the same water as the tank, they are one unit. The issue at hand should be the amount of flow travelling through the skimmer itself, to achieve optimal contact time. The skimmer will grab the same number of protiens regardless of turnover, assuming that the minimum turnover is achieved. I agree with Steve on this one.
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
http://www.canreef.com/vbulletin/showthread.php?t=55041
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