See the four small bolts? Those are to get at the impeller, take it apart and give that a clean. Maybe soak the impeller parts in vinager to melt any coraline algae in there. Also, the air vents are the tricky part to cleaning the thing. You have to be inventive but I "flossed" through some string and crafty pipe cleaners to clean it. Use a flashlight to look through the air slits, it's tricky and you probably have to take it off the tank to do this. Just be inventive, use Q-Tips to clean the fan blades and stuff, it's not brain science.
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