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Old 01-26-2011, 02:34 AM   #1
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Return pump for my 75 gallon reef tank

Looking to get a mag return pump tonight off of ebay. I have heard I need a mag 5 but just wanted to see some other opinions. I have a built in corner overflow. I want to make sure my overflow can keep up with the pump. Water will have to come up about 4 feet to display tank. Anyone?
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Old 01-26-2011, 05:34 AM   #2
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Depends on how much water your overflow is rated for? If it's 1'', you could use a mag 7. At 4ft it should only push around 500gph or so.
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Old 01-26-2011, 10:34 AM   #3
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i would go with a 7, but a 5 would work too. your overflow will definitely handle a 7.
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Old 01-26-2011, 10:45 AM   #4
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Do the 7. More water turnover is alsways better, especially for reef setups. Even if not reef, I'd go 7 anyway.
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Old 01-26-2011, 02:20 PM   #5
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would putting a shut off valve in the line after the pump allow be to control how much it pushes by slightly closing it or would it be bad on the pump?
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Old 01-26-2011, 03:39 PM   #6
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no. it would actually lengthen the life of the pump, and also use less electricity.
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Old 01-26-2011, 04:04 PM   #7
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so good idea just incase? or are we absolutely sure my overflow could handle a mag 7? My overflow measures 1 1/2" inside measurement.
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Old 01-26-2011, 04:06 PM   #8
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i'm absolutely sure. i believe that overflow to be somewhere in the 1200 gph range if i'm not mistaken.
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Old 01-26-2011, 04:48 PM   #9
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awesome, thanks man. I'll order the mag 7 now
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Old 01-26-2011, 05:28 PM   #10
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Yes I have a 7 on my 120 with 4 feet of plumbing. works just fine. i would add a shut off valve for sure (i am missing that). i bought a 9 for my return but it is still in its box, the plumbing was all set up already with the 7, so why alter a good thing ?!? :P

good luck and you will love it im sure.
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