I use and have good luck with the Emporer 280/400. I currently have 2 280's on my planted 60 at either end of the tank facing each other. They are large enough for customized filters and media, provide good water flow and the bio wheel/s work flawlessly with the spray bar hitting them directly. I have an AqueClear 20 on my 10 hex and truthfully I am not impressed. Had to exchange it twice due to bad motors and it plugs up quickly. Doesn't seem to push much water, but my tank is sparkling clean, so it must just be my perception.