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First you must decide which pump you will using for the return. Then you can use the overflow calculator on reef central to determine the size of holes you need for the overflows. I usually say to go a bit bigger just in case you want to upgrade down the road. Personal preference will dictate how far down you want the holes because this will determine your water level in the tank. I have mine close to the top so you can't see the water line.
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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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