is 400 GPH too strong for my tank???

octopanda

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Hello everyone. I ma upgrading my 20 gallon aquarium's filter for more filtration... and i want to know if 400 GPH is too strong for my 20 gallon long aquarium. Thanks!!!
 

Anders247

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It seems a bit excessive to me too. That's about 20 times the tank size...... octopanda, 250 seems a little bit over still.
 

Akari_32

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I don't see anything wrong with overfiltering as long as the fish aren't blown around. I like to see at least 10x the volume being turned over every hour, which would be 200 gph on a 20 gallon tank, and I often do much more than that. Most fish are fine with it, and it does help keep waste out of the gravel and add some more space for good bacteria.
 
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octopanda

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would that do the trick ??? i have heard good things about these filters and it is 200 GPH.
 

Coradee

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There's no such thing as over filtering as long as the flow isn't blowing the fish around the tank, what fish do you have in the tank?
 

CindiL

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would that do the trick ??? i have heard good things about these filters and it is 200 GPH.
Hi, I have two of those filters on my 35 gallon and I love them. They don't have room for bio-media though. Here is a link on how to modify them if you want. 200 or 250 should be fine. On my two filters I put a little piece of filter padding under the outflow area and it really helps with subduing the current.

https://www.fishlore.com/fishforum/filters-filtration/191546-modifiying-aqueon-quiet-flow-filters-additional-media.html
 

Akari_32

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would that do the trick ??? i have heard good things about these filters and it is 200 GPH.
I would do an AquaClear, personally. That way you have lots of room for media. I would get a 70 and a 20 or 30. Or you can do what I did for my 29 gallon and buy one of these...



Worked great! Some even use them on 10 gallons, but I wouldn't go that far. A 20 gallon would be fine. The flow isn't as strong as you'd think.
 

macca

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Why not run two of your current filter on opposite ends of the tank? I prefer to over filter than under. I have 3 filters currently running my tank. This helps reduce dead spots, good circulation, even temperature through out and surface agitation.

Other benefits of multiple filters is the fact that I can service them individually on separate maintenance schedule to avoid mini cycle. Regular filter maintenance help keep nitrates to a minimum.

Also, in the event I have an issue with fish, I can immediately eliminate, lack of oxygen, temperature fluctuations, lack of filtration, ammonia, nitrites etc.
 

alink

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Just a side note that manufacturers calculate the GPH without any media in the filter. So you can figure the actual number with your media in is a good amount lower, a good estimate is 75% of the stated GPH. That number goes down as the filter media is used and clogs up.

20 gallon tank x 10 cycles per hour = 200 GPH. factoring in the 75%, you would need 266 GPH as stated by manufacturer. So with that I would say 250-300 would be good.

I have 650 GPH on my 50 gallon which is actually about 487 GPH with the media in place.
 

JFreshwater

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I have an AquaClear 50 and that Quietflow 30 on opposite ends of my 38g. They're both great filters. I've noticed that the QuietFlows push water more horizontally because they have a bottom lip on the water exit, compared to the AC which has the standard water drop exit. So IME the Quietflow does create a tiny bit more surface agitation, but the AC has awesome space for media.
 
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octopanda

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so i am going to get another marineland biowheel 150 because i have had good experiences with them. Then i will run both on the same tank. That would be about 200 GPH if you count all of the media i stuff in my filters. thank you for all of your help!!!
 
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