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Old 12-02-2003, 11:22 AM   #1
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I have a question about my Fluval...

Well as you have seen in an earlier post my tank set up is not as bad as I thought it was.. I have just another quick question.. My output from my Fluval 404 says to put is above the water line..Why?? What would happen if I just pushed it down below the waterline so I didn't have to hear the waterfall sound? Is there a reason that it is supposed to be above the waterline?? I know that during set up that sound was responsible for numerous RestRoom breaks

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Old 12-02-2003, 11:32 AM   #2
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Quote:
My output from my Fluval 404 says to put is above the water line..Why?? What would happen if I just pushed it down below the waterline so I didn't have to hear the waterfall sound? Is there a reason that it is supposed to be above the waterline?? I know that during set up that sound was responsible for numerous RestRoom breaks
They tell you that so that you create surface agitation. Helps with gas exchange by keeping the O2 level up and the Co2 level down. If you put it below the water's surface, not only will you not get efficient gas exchange, but you will also notice that with no surface agitation, you will develop a "skin" over the top of the water unless you have a skimmer or overflow helping to break it up. That "skin" is basically organic compounds that have collected on the top of the water.
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Old 12-02-2003, 11:34 AM   #3
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I have no idea, I've never heard of that, I wouldn't think back siphoning would be an issue on a closed loop like a cannister filter.
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Old 12-02-2003, 11:37 AM   #4
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I don't think back syphoning would be an issue with a canister as both ends are in the tank. The only drawback would be the detritus will be pushed back into the tank if the flow was reversed.

I would think it more for surface aggitation. Gas exchange occurs at the surface of the water so it must be constantly moving for this to happen. The return does not need to be above the water line for this to work though. It can be just at the water level or in it's place a powerhead can be used instead. As long as the surface water has a good ripple movement, it does not matter what's doing it...

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Old 12-02-2003, 11:37 AM   #5
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So it is ok to keep it down since i have a skimmer??
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Old 12-02-2003, 11:40 AM   #6
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The skimmer will not produce sufficient movement at the surface to provide proper O2 in the water. You will need to use a PH if the canister return pipe is not a good option based on your set up.

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Old 12-02-2003, 12:00 PM   #7
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Ok I will get a powerhead on my lunch hour... Does that have to be above the waterline as well?? My wife and I are just not to crazy about the trickle sound.. that is why we got the Fluval over the Penguins..

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Old 12-02-2003, 12:13 PM   #8
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No, the powerhead doesn't need to be above the water. It just needs to be positioned so that its current breaks the waters surface. I have my power heads pointed toward the middle of the front glass of the tank. When the current hits the tank, it goes up and breaks the water's surface.
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Old 12-02-2003, 12:18 PM   #9
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Same with mine Biggen. The Fluval 404 is powerful enough to break the water tension positioned below the surface if it is pointed up at a very slight angle.
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Old 12-02-2003, 12:29 PM   #10
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Thanks for the quick answers again.. I will be heading out around noon back to the LFS (I swear I just paid a semesters tuition for his kid) with a 55 gallon and a Fluval 404 any suggestions on what powerhead to get??
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