I have a 200 Gallon, 7' x 2' x 2', aquarium and I was looking for better filtration. I was looking looking at the Fluval Fx6, Aqueon ProFlex Model 4, Eshopps Rs-200, and the Eshopps Rs-300. If anyone has any experience with these filters/sumps, I would love recommendations. I have checked, and I have room under my stand for any of the sumps. Currently I am running two Eheim 2215's (bought them on mistake thinking they were 2217's).