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#1
11-28-2009, 07:23 AM
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1 inch is about 600gph
some good info on this site alot of good reading http://www.wetwebmedia.com/marsetupindex2.htm
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65 gal tank 40 gal sump 20 gal Q tank 75 gal total frag system 200gal system in the works 4 year exp salty 
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#2
11-28-2009, 03:26 PM
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Its always a good idea to oversize your return. if something gets stuck in it you dont have to worry about it being too small. there is no down side to having a pipe thats too big, except a very minor price advantage on small PVC at the store.
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#3
11-28-2009, 06:50 PM
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If you looking for a bulkhead size in your sump to feed your pump should be okay with the same inlet size of you pump (just don't reduce). It's not really a gravity feed since under suction so the 1" can flow more the the 600gph.
If your talking sizing a drain on your display to match the output flow at head from your pump that's different. These two links might be helpful; RC Headloss (use Velocity T4) and RC drain size.
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my tank
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