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Old 08-24-2010, 10:50 AM   #1
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Tank turnover rate

I am trying to get a decent flow rate in my 90 gallon tank. I just bought a KORALIA 1 UL 400 gph 4W in addition I have a Eheim canister filter which gives me about 250 gph. Therefore, I know that my total GPH is 650 but how do I calculate my turnover rate. Most of the articles that I am reading constantly mention 10x, 50x, 90x, etc. But my concern is that I don't know how to calculate my turnover rate.
Please help...
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Old 08-24-2010, 11:46 AM   #2
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people do it different ways, some just take the 90g you have times 10x per hour, turnover rate is 900gph. And then some people take their 90g minus the amount of water displaced by their rock, to find the actual amount of water in there, and then multiply that number.

I always use the first one because IMO its better to have more flow then less.
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Old 08-24-2010, 11:51 AM   #3
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Okay...the first method makes it much simpler to understand. Based on that method my calculation is saying that I have just about 10x flow rate. I think I will get an additional PH to increase my flow.
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Old 08-24-2010, 11:57 AM   #4
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Jimbo covered it perfectly. I too prefer more flow. We're running nearly 20x on our 50G and I'd like more.
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Old 08-24-2010, 12:00 PM   #5
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MP40?
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Old 08-24-2010, 12:01 PM   #6
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Any recommendation on how to locate/position the PHs. My canister filter is "shooting" towards to the front of the tank now and my skimmer is hang-on
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Old 08-24-2010, 12:04 PM   #7
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Quote:
Originally Posted by Jimbo7 View Post
MP40?
If I had money to burn. lol

Quote:
Originally Posted by rncarter View Post
Any recommendation on how to locate/position the PHs. My canister filter is "shooting" towards to the front of the tank now and my skimmer is hang-on
It will be a trial and effort thing and depends on rock placement etc. Just adjust them for as turbulent and random a flow as possible until you get them where you like. Usually a good starting point is to aim them from the back corners to meet in the middle of the front glass.
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Old 08-24-2010, 12:09 PM   #8
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That is a loaded question my friend. It all depends on several factors, what you are trying to do, what is in your tank, where is your rock...etc. A lot of people shoot for a circular flow around the tank with one or more power heads sweeping from the back shooting forward. This gives you lots of flow and exchange of nutrients, while also randomly creating breaks in the pattern which has been shown to stimulate coral growth and healthy fish.

If you are really interested I have a bunch of articles at the ready.
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Old 08-24-2010, 02:43 PM   #9
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Jimbo, I am interested in the articles!!! Are they in the apptly named articles section?
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Old 08-24-2010, 02:58 PM   #10
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Quote:
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Any recommendation on how to locate/position the PHs. My canister filter is "shooting" towards to the front of the tank now and my skimmer is hang-on
Here is a diagram of some placements:
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