Tropical Fish Keeping - Aquarium fish care and resources

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-   -   what size filter(s) for a 20gal? (

yippee 03-14-2009 01:19 PM

what size filter(s) for a 20gal?
just like the title asks, what size filter(s) should i run on my 20 gallon tank? I currently have two 5-15 gallon filters or a 30-60 gallon filter. would it be okay to run either of those on the tank (two 5-15's together or the single 30-60)? How much flow is too much flow?


JohnnyD44 03-14-2009 08:23 PM

I currently run a Marineland BioWheel 200 on my can pump up to a 30G.

Unless your lid is different, I'm not sure there is a cut-out to acutally run two filters. Either way a pump which can handle a 30G tank will be fine.

Depending on your in-take tube, you can moderate your intake to the pump

Tyyrlym 03-18-2009 09:03 AM

Do you have any manufacturer information about these filters, like who makes them? It can make a difference.

I'd be hesitant to put a 30 to 60 gallon rated filter on a 20 gallon tank. While some fish don't mind a lot of flow there are many who will not enjoy it. While the paired smaller filters might work, it's going to depend on what kind they are, larger internal filters can suck up a lot of tank real estate making them unattractive.

yippee 03-23-2009 01:31 AM

Sorry, I havent had much time to be online lately. The smaller filters are a cheapy regent/aqua tech walmart special back when they carried them. I first got them when i was young and didn't really know the difference in quality products. Since i've gotten older, they seemed to still work well in 10 gallons so i have kept on using them for simple 10 gallons. They seem to work great for no bigger of a tank than it is, and no more fish than they house. I have run the larger filter in a 20gal wide briefly and it did look to cause a lot of water motion. I thought the dual small filters might work. If not i should probably look into getting something between the two.


Tyyrlym 03-23-2009 07:08 AM

For a 20 gallon I'd go with a Penguin 150 or 200. They're pretty much top of the line.

yippee 03-23-2009 02:19 PM

i've heard the emperior is top of the line for HOB, what is better about it than the penguin?

Tyyrlym 03-30-2009 08:09 AM

The Emperors are the best HoBs you can get but the smallest one available is a 280. That's 280 gph of flow. In a 20 gallon that's a lot of flow and overkill really for a filter. The Emperors have large filter sizes (larger filter media means more surface to flow through which means slower flow and better mechanical filtration. The bio-wheel is also spray-bar driven, giving them better contact with the water.

Still, a Penguin is a great filter and the smaller ones will do you just fine with a more appropriate flow rate for your size.

yippee 03-31-2009 01:33 AM

Thanks for the clarification. Personally would you think a 150 or 200 would be better for the 20 gallon?

Tyyrlym 03-31-2009 06:15 AM

I'd probably go with the 200.

JohnnyD44 03-31-2009 07:52 AM

I have a penguin 200 on my 20G and it works great. i plan on using the same filters for my 55G

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