good choice of fiter! Now, as previously mentioned from a filtration point of view you can't really have too much flow. Where it does become problamatic is if you have a heavily planted tank and too much water movement/surface agitation. Plants do best with a slow to moderate circulation. A spray bar placed just below the surface will disperse the flow nicely. Alternatively the output from the filter can be reduced using the taps, but be weary of putting any back pressure on the pump resulting in noise, which will lead to un-nessasary wear