Question about fixture sizes

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Hey everyone

 

I plan on setting up a 16H nano (same footprint as a 10g regular, but taller).

 

I plan on purchasing the AquaticLife T5 HO 24 inch.

(http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+3733+13822+21460&pcatid=21460)

 

I know, they make a 20 inch, but I would rather use the 24 for a wider selection of replacement bulbs.

 

Does anyone have this fixture on a 20" tank? Is the overhang noticeable? And can you provide some pics?

 

Thanks for any help!