Koralia Evo 600gph

I got this pump for Christmas (the 'Evo 550') rated at 600 gph and thought it might be overkill for my 28g nano cube. When i got it running it is much less flow than i was expecting... is it possible i've configured it incorrectly or should i just buy a larger koralia for better flow?

http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=23592

Thanks
 
I think i may be expecting the results similar to what a powerhead would provide. It seems like the koralias move large amounts of water where the powerheads may provide a more refined stream. I may try to exchange if they will allow me to and get a 1050.
 
Now debating on picking up one or two maxi jets after seeing how cheap they are: http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4586+23760&pcatid=23760
 
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