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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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Old 01-26-2011, 05:56 PM   #11
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Old 01-28-2011, 05:29 PM   #12
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Thinking I'm gonna do flexible tubing that way its quieter and i can move it around to break away salt creep inside the tube... sound like a good idea? Can you put a shut off in the flexible stuff?
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Old 01-28-2011, 11:44 PM   #13
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flexible is good, but i don't think you'll see any salt creep on the inside of the tube. it will be wherever water is splashing, on nearby surfaces.
you don't need a shut off on the drain. you'll never use it. all you need to do is unplug the pump.
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Old 01-29-2011, 11:06 AM   #14
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I have never heard of getting a longer life by cutting off flow from a larger pump. That's cool. I just upgraded a little, but it would be nice to get a big ol pump and dial it back.

I have gates on the output. Why wouldn't you? It helps keep the water in the main tank when doing water changes in the sump. Or stopping a mess if the sump cracks. I need mine to control flow to the skimmer.
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Old 01-29-2011, 11:47 AM   #15
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yes, i always thought the opposite, but my friend is an HVAC and water treatment pro. he told me to google it. as so it was true. the only place where people tell you choking a pump will hurt it, is in this hobby...LOL.

all you have to do is turn off the pump and the water stops coming down. why do you control flow to the skimmer? why not leave it wide open?
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Old 01-29-2011, 11:53 AM   #16
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The double use of the post-pump shutoff is that when you do unplug the pump for maintenance, you can shut off the vale and stop the backflow, then just let the tank drain down through the overflow.

However if your tank is set up like this you need to do a power outage test, unplug the pump and let it drain to make sure you don't flood the sump. Sorry for the hijack, just my 2 cents
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Old 01-29-2011, 11:56 AM   #17
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yeah....best to have that reverse siphon hazard sorted out.
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