I would recommend a skimmer. They not only remove dissolved organics, they also oxygenate the water very well. If you choose to go with a skimmer, try to get a decent one, there are some that aren't very good. The Aquamaxx is one I'm using now and I like it. I also have the Eshopps, and I think it's a decent HOB. I wouldn't recommend the regular Remora, but the Remora Pro is pretty good, as well (however, it has the pump inside the tank, which is unsightly). There are several other decent ones, and you might want to ask on the skimmer thread in the Equipment, Lighting Forum. Mojo is the name of the skimmer guru on that thread.