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Old 07-06-2011, 08:35 PM   #1
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Canister for a 20g

I have 20g sw tank with a Aquaclear 50 and a Fluval U1 underwater filter, I want to take the u1 out and add a canister filter, one that can be above the tank in a cabinet. Any suggestions ?
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Old 07-06-2011, 08:37 PM   #2
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Not sure on the SW side if it makes a difference, but I love the Eheim Classic canisters for FW applications. They are reasonably priced, reliable, durable, and right sized for the type of application you are looking for. They are also so quiet you can't tell it is running. I have a couple of the Eheim 2213s.
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Old 07-06-2011, 08:42 PM   #3
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Not sure on the SW side if it makes a difference, but I love the Eheim Classic canisters for FW applications. They are reasonably priced, reliable, durable, and right sized for the type of application you are looking for. They are also so quiet you can't tell it is running. I have a couple of the Eheim 2213s.
can it be placed above the tank?
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Old 07-06-2011, 08:47 PM   #4
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No, I don't believe so. Most, if not all canisters need to be below the level of the tank. They rely on siphoning action to get the water out of the tank. Someone can correct me if I'm wrong, but I think that's pretty universal.
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Old 07-06-2011, 09:26 PM   #5
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does any one know a canister filter that don't use siphoning so it can be about level or just above the tank?
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Old 07-06-2011, 09:59 PM   #6
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Once the filter is running you can place it up above. If you loose power it will loose prime up there and if you are not around burn up the pump when power is restored.
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Old 07-06-2011, 10:26 PM   #7
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Once the filter is running you can place it up above. If you loose power it will loose prime up there and if you are not around burn up the pump when power is restored.
Ok I bout and returned the Fluval canister it would not work above
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Old 07-07-2011, 12:34 PM   #8
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Any one a canister that will work above for sure??
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Old 07-07-2011, 02:28 PM   #9
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Quote:
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Any one a canister that will work above for sure??
It's my understanding that most all canister filters need to be below the tank and even then, there's a limit to the distance from the top of the tank to the canister below. For example, my fluval 305 had very specific specs on this when I was first setting it up.
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Old 07-08-2011, 05:34 PM   #10
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Marineland make a h o b canister not sure if its any good though
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Old 07-09-2011, 02:06 AM   #11
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Marineland make a h o b canister not sure if its any good though
An HOB canister?

Interesting idea I'm gonna have to check out. Thanks!
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Old 07-09-2011, 07:44 AM   #12
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Look on petmountain.com
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Old 07-09-2011, 10:24 AM   #13
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I think Hondatek is referring to the Marineland Magnum H.O.T. canister filter system. The HOT means hang on tank, same as HOB hang on back.

H.O.T. Magnum Compact Hang-On Tank Filter by Marineland - Filters - Fish - PetSmart


On my 20, mind you it's a FW, I run two Rapids mini canister filters. Each is rated for 20g but we all know manufacturers tend to pad that rating. They come with a rack that hangs on the tank so that they are at least tank level. Kind of like the Magnum above.

Rapids Mini Canister C 80


Like others have stated, I don't think most canisters except these two can be kept above the tank for siphoning reasons.
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Old 07-09-2011, 11:05 AM   #14
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Yea that's the one . Don't know how good it is but that's the only canister I seen that's not under the tank
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