Hello, I haven't posted here in months, I'm the person that bought the ecosystem filtration and was having problems with it. Well, I'm still having problems with it. We waited all this time and saved money and bought a 6 stage RO system, well, the water still cloudy and yellowish on the ecosystem after follow manufacturer's direction to a T. The bottom line is that I want to buy a regular filter and forget about this ecosystem deal. I have a 55 Gal. tank and would like to be able to have basic corals and fish. What kind of filter would you guys recommend? I was thinking about a Fluval 404 (350 gal/hr), is this ok? I already have a seaclone skimmer. Thanks to all.