I bet a 5" longnose could eat just about any invert in one's tank.  Other than the size I would definitely recommend going for one, I've always been fond of them.
I've always found chromis and cardinals to be rather dull. 
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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