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Old 01-10-2005, 03:12 PM   #1
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Powerhead Required?

I have a 40g tank, running with a 200gph Eheim Canister filter and a skimmer that I'd say cycles 40-50gph. Should I add a powerhead to get increased circulation or does what I have sound sufficient? What is the typical target range for circulation gph?

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Old 01-10-2005, 03:14 PM   #2
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I would add at least 1 200GPH PH. Have it interact with the flow from your canister. If it were me, i would find 2 small PH,s 100-150GPH and add them to interact with each other.

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Old 01-10-2005, 03:16 PM   #3
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I would, what you have right now is not really enough IMO. I lot of people run marine tanks with a 20x or so water turnover rate to reduce dead spots and keep water moving through the rock. You have a 6X turnover rate, very low for a marine tank.

15X is a good target and you can adjust it from there. More imporant than the total flow will be position powerheads and water outlets to eliminate any possible dead spots.
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Old 01-10-2005, 03:18 PM   #4
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It depends on what type tank you want. FO or reef. I was always told about 10x per/hr for FO and reef up to 20x. Some will recommend even more.
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Old 01-10-2005, 03:52 PM   #5
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all good comments...yes definitely need another 200gph...I'd probably go with a maxijet 1200, which I think is 295gph. 10 x per hour is the minimum. i'm skating somewhere around 14.5x per hour.

You can't really count the skimmer flow.
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