I know nothing about differant skimmers, so no help there but I have a Seaclown and it works but is funny, and I don't mind having a skimmer that doesn't take out every last speck of stuff in my tank right away, if it did there would be nothing for my corals.
What im getting at is, Is your water very dirty or are you just being overweary, maybe the one skimmer you have just takes out the excess and would be fine on its own, im not sure of your whole situation, just thought id try to help.