If you do not want to get into a more complex canister filter right now, recommend take a look at this little marvel: Ovation 1000 Submersible Power Jet Filter. I have one and has worked great in various set-ups. Once water is cycled changing 1/4 to 1/3 of it on weekly basis and rinsing sponge in removed tank water should be enough to keep nitrates down to acceptable levels.