Enough flow? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 04-21-2010, 04:34 PM Thread Starter
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Enough flow?

I MIGHT be setting up a 40 breeder and was wondering, how much flow is enough? I keep reef tanks and know you need quite a bit of flow there, but I'm unsure how much is enough for a FW tank. I was thinking of 2 x Maxi-Jet 900 Powerheads? Each one puts out 230gphwhich makes it a total of 460 gph, which is 11.5 turn over rate. Here is a picture of what I was thinking.





Tank will be medium-heavily planted BTW.

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post #2 of 9 (permalink) Old 04-21-2010, 05:09 PM
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A lot has to do with what type of filter and its placement also. What filter will you be running? Will you be doing CO2 and high light? With lower light and no CO2, you won't need nearly as much flow.

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post #3 of 9 (permalink) Old 04-21-2010, 05:12 PM
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In freshwater tanks you can deal with significantly less flow than saltwater. A turn over of 5 times per hour is pretty decent in a freshwater tank so what you have is probably fine.

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post #4 of 9 (permalink) Old 04-21-2010, 05:31 PM Thread Starter
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Quote:
Originally Posted by 2wheelsx2 View Post
A lot has to do with what type of filter and its placement also. What filter will you be running? Will you be doing CO2 and high light? With lower light and no CO2, you won't need nearly as much flow.
Tank will be 40 breeder, 2 x 39 watt T-5s, possibly pressurized CO2. Was thinking about just doing daily-every other day water changes, so I won't really have any filtration except some filterfloss filtering the surface scum.

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post #5 of 9 (permalink) Old 04-21-2010, 05:49 PM
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If you're not using any filtration, then 10x per hour is about right I think. So your setup is not far off.

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post #6 of 9 (permalink) Old 04-21-2010, 05:56 PM
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There is no "set" answer; you need enough flow to prevent any dead spots where debris can accumulate.

Some tanks need more than others, depends largely on your hard- and plantscape.

I run around 10x/hr on most of my tanks.





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post #7 of 9 (permalink) Old 04-21-2010, 11:46 PM
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No bio filter? Interesting...what are you going to stock for fish?


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post #8 of 9 (permalink) Old 04-22-2010, 12:30 AM Thread Starter
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No bio filter? Interesting...what are you going to stock for fish?
Not sure, but I think I'm going to have 25 neon tetras and a few other fish.

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post #9 of 9 (permalink) Old 04-22-2010, 06:54 PM
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With a mature well cycled tank your substrate can do a lot of biofiltration. I have no idea how many fish you could keep though.

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