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Old 11-15-2005, 01:54 PM   #1
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Fluval 204 output tube

OK, I spent a lot more than I wanted to on a fluval 204 because I wanted my tank to be as quiet as possible. Then I get the thing home and the instructions say the output tube has to be obove the water line. WTF? That means its no more quiet than decent HOB? So is this true, does the output tube HAVE to be above the water line or not?
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Old 11-15-2005, 05:18 PM   #2
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I'm sure that it can be inserted into the water. Are you sure that's what it says?
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Old 11-15-2005, 05:40 PM   #3
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I'll double check, but I'm 97.5% sure
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Old 11-15-2005, 06:02 PM   #4
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I own a Fluval 304 on my marine setup and it definitely does say to keep above the water line. However, I have mine below the water line for some time now without any issues. When the Fluval starts for the first time you will here some noise like something is wrong. But that should dissipate in a few days and it will run silent.
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Old 11-15-2005, 10:15 PM   #5
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I have a Fluval 404 and I have it running below water with no problems. It is high enough to get some surface agitation for gas exchange though. As I remember, the main issue is that you want to start the filter with the output above water. After that, it is irrelevant. I don't remember hearing any noise when it was first started, but I can say it is just about silent.
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Old 11-15-2005, 11:09 PM   #6
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So what do you guys do when you change media? Just fire it up again afterwords?
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Planted 35 Gallon Hex Freshwater

Fish - (4) Rosy Tetras, (5) Zebra Danios, (4) Platies, (3) Rainbows, (5) Albino Cories, (2) Ottos

Plants - Micro Swords, (2) Rotala, (2) Camboba

Light - 40w (~1.1 wpg)

CO2 - DIY generator with Hagen diffusor
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Old 11-15-2005, 11:14 PM   #7
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Could also put it at the water line. Will give a little surface aggitation without the water falling, thus making it quieter.

My personal opinion, I like the sound of water. My new 55G is in my master bedroom next to my bed. The sound of running water from the HOB puts me to sleep.
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Old 11-16-2005, 02:07 AM   #8
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From my reading of the instructions, and I am going from memory, it only states that the outlet needs to be above the waterline when starting it off.

After it is running I am sure you can put it under the water.
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Old 11-16-2005, 02:15 AM   #9
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it might be to keep from causing a vacume when its first kicked on but honestly that whould be rare.. it should run better submerged.. you louse a little GPH if it was above the water constantly..
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Old 11-16-2005, 09:03 AM   #10
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Thanks guys. I moved it down a little lower and boy am I HAPPY! This is exactly what I wanted from a noise/performance level. Good recomendation.
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Planted 35 Gallon Hex Freshwater

Fish - (4) Rosy Tetras, (5) Zebra Danios, (4) Platies, (3) Rainbows, (5) Albino Cories, (2) Ottos

Plants - Micro Swords, (2) Rotala, (2) Camboba

Light - 40w (~1.1 wpg)

CO2 - DIY generator with Hagen diffusor
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