Exactly the opposite, older rock generally has less diversity, which is reasonably desirable. Although most any live rock will provide the filtration capability that we use live rock for in the first place.
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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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