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Marineland recommends the 220 for tanks up to 55 gallons. I tend to cut the estimates in half because the manufacturers estimations of filtration requirements are optimistic at best. I'd get either a bigger filter for that tank or a second filter. The Eheim 2217 is a fine choice as is a SunSun HW-304B but there are many other excellent choices out there as well depending on what is available where you are.
