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Old 06-25-2009, 06:49 AM   #1
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hi all recently got a new 40g tank it will be fish and corals such as zoas finger leather im just wondering how much gph my powerheads should be pushing in a tank this size thanks in advance
tracey
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Old 06-25-2009, 09:52 AM   #2
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I would love to know as well if there is some formula

is it something like 4 x TV = DGPH ?

TV = total volume
DGPH = desired gallons per hour
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Old 06-25-2009, 09:58 AM   #3
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Does the tank have an overflow/sump?
Is it 40g long or tall?
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Old 06-25-2009, 10:01 AM   #4
Thanx but no.....


 
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10-20 times .. so 400-800 gph + (includes your sump return if applicable). As always it's a guideline.
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Old 06-25-2009, 11:01 AM   #5
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hi its 40g long no sump/overflow i have the power head pushing 800gph at the min is this enough or should i supply more?
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Old 06-25-2009, 11:06 AM   #6
Thanx but no.....


 
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800 is fine... another one to create more turbulent flow (pointed at each other) would be better.. But at 20 X, that's fine. I assume you also have a HOB or canister that is adding flow too... That flow counts also.
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Old 06-25-2009, 12:00 PM   #7
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ok thanks i have an ehiem filter system external which creates a little flow maybe i might invest in another ph thanks to all for the help
tracey
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Old 06-25-2009, 12:27 PM   #8
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With marine tanks, you can rarely go wrong by adding more water flow. If you've ever gone snorkeling in a fringing reef, you'll know what I mean. There is a constant movement of water. While I currently do not maintain any marine tanks, in the days when I did, in a four-foot marine tank, I would typically place a Penguin 1140 powerhead in the back left and right corners, as well as use two Penguin 330 Bio-Wheel filters, one on the back left, and one on the back right. This would provide sufficient water movement for anemones, corals, etc.
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