Go with the Fluval it's better than two Eheim Pro 2028's. Eheim filters are underpowered and overpriced. They don't have the flow to keep up with with the ebay filters let alone an FX5. The only reason I bought an Eheim 2217 was because people swear they're the best, but those people don't know what they're talking about. It's been the most disapointing filter I've ever owned. This big ass 2217 can't even keep up with a little Mag 350. The only thing the Eheim has going for it is bio filtration which a cheap sponge does 10 times better. The Eheims totally fail at Mechanical filtration which is what keeps your water looking clean. If anybody tries to sell you an Eheim run away and don't look back. There are much better and affordable options from Rena, Fluval, Marineland and SunSun/Aquatop. Eheim imho is overrated just like everything else that comes out of Germany. This coming from a guy who owns two German cars (never again).