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Old 02-19-2013, 07:22 PM   #81 
waterdog
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Originally Posted by MooseKnocker View Post
What would be the best sponge for a 2.5 gal?
In a 2.5 I like the flat sponge the best. It takes up almost no room and is easily hidden. If you look in my picture album in 'My Tanks' you will see a closeup of the one in my 2.5
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Old 02-19-2013, 07:29 PM   #82 
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Ah! This reminds me of a question I had ages ago but forgot to ask! How does the flow of bubbles affect filtration? Are more bubbles better, or is it just a matter of preference? I'm still fairly clueless on this particular topic and hanging on every word in this thread pretty much. Learning is good, heh. ^.^
In theory the more bubbles the faster the flow through the sponge. Just remember you don't want so much that you churn the surface. You should adjust it so you just have a gentle ripple on the surface.
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Old 02-19-2013, 07:31 PM   #83 
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In theory the more bubbles the faster the flow through the sponge. Just remember you don't want so much that you churn the surface. You should adjust it so you just have a gentle ripple on the surface.
A gentle ripple on the whole surface area (talking a small tank, 3-4 gal) or just the area around the filter? Thanks for being patient with me, just like to clarify everything to make sure I'm understanding correctly. >.<
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Old 02-19-2013, 07:33 PM   #84 
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Around the filter area
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Old 02-19-2013, 07:46 PM   #85 
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Around the filter area
Cool, thanks. :)
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Old 02-19-2013, 08:52 PM   #86 
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Thanks, sparrow hawk. I'm watching and learning also.
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Old 02-20-2013, 02:38 AM   #87 
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As Waterdog says, smaller bubbles are more efficient; they move more water for any given airflow. You can or should only turn down the flow so much. Too slow and it's not filtering much at all.

If you've got it adjusted to just ripple the surface, rather than turn down the flow (and diminish the filtration) you're probably better off putting a flat open sponge above the lift tube to catch the bubbles and smooth the flow. Juditko will tell us how that pre-filter sponge works over time. Java moss is as good and I like the way it looks.

If you're curious, you can actually determine the flowrate by holding the filter at an angle and letting it flow into another container. Time it and measure it. ATI Hydro explains how to do this. That will be the minimum flow you can expect at that setting.

If the surface is rippling, that's an adequate flow rate for me.

A sponge filter bio-filters well, with less flow than a typical HOB, because it uses a relatively larger foam block for housing nitrifying bacteria. A good HOB can be a better mechanical filter. Many serious keepers use both.

Last edited by Hallyx; 02-20-2013 at 02:50 AM.
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Old 02-20-2013, 05:30 PM   #88 
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I can message a Mod to make this a sticky!
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Old 02-20-2013, 07:01 PM   #89 
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Great idea, Perry!
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Old 03-06-2013, 12:17 PM   #90 
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If you would like to see a video of a sponge filter working, click this link: http://www.youtube.com/watch?v=F_7jnfYrhss

Special thanks to finnfinnfriend for supplying the video and link!

Last edited by waterdog; 03-06-2013 at 12:34 PM.
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