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I'm not an engineer but here's what I figured. If you have a 1" return but only use 3/4" output holes, it will create back pressure on the main line. This, in theory, should pressure up the main line enough to have even flow out of all holes. Kind of like those long irragtion hoses with all of the tiny holes in them. A pressure rated pump will keep the line pressured better than a none-pressure rated pump.
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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
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