Filter Size for Large Tanks

**azarras** · 06-18-2011, 11:28 AM

What is the general rule of thumb when determining the size of the filter needed for a large tank? I have read the filter should cycle the tank 4 times per hour. Is this correct? I am deciding on a 120 gallon or a 210 gallon tank and want to go with Fluval FX5 plus an Aquaclear 110. If I go with the 210 do I need two FX5s? The tank will be a discus tank and I know water quality is critical for these fish. Thanks

**gm72** · 06-18-2011, 01:06 PM

For the 210 I would agree with dual Fluval FX5 filters. I am an Eheim guy myself so I would probably go with dual Eheim 2260 filters or maybe one of each. Fluval has significantly higher flow while Eheim has significantly higher media capacity when comparing those two filter.

**Cliff** · 06-18-2011, 01:57 PM

I don't think too much would really change from your orginal plan of a 180 gallon tank that you asked about in your last thread

If your going with a 120 gallon, I would suggest a FX5 and a AC110

If your going with the 210, I would suggest two FX5s

My recommendations are based on my experiances using a FX5 on a 90 gallon tank.