I realy like the xP3 or 4 series. I know it's not a fluval 5 series. But I purchased the fluval 406, new gen after the 405. It realy did not impress me at all, plus I had a weird leak at the housing seal. I returned and bought 2 xP3's for my 60g. Could not be happier! Everyone here is right about the DIY media. I have bio stars, fluval ceramics, and about 50 pot scrubbers between both filters. I say go with the xP4! Plus they sell
Here for 180 at the family owned lfs.