07-03-2011, 04:38 PM
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I didn't author the Corydoras aeneus profile so I shouldn't second-guess Natalie, but I suspect the "hardiness" refers to the species' remarkable tolerance for differing water parameters. Unlike the majority of cory species that are endemic to a stream or river, C. aeneus is widespread over much of the northeastern portion of the South American continent, east of the Andes from the La Plata basin in northern Argentina up through much of Brazil, Paraguay, Bolivia, Peru, Columbia, Venezuela, the Guyanas and even on the islands of Trinidad and tobago. Much of these waters are acidic or slightly acidic and soft, but some are slightly basic and even medium hard. And the many decades of tank raising this species has made it adaptable to almost all freshwater conditions.
They are still individually as susceptible to changes and conditions as Mikaila said. Stable water at whatever parameter is still necessary for good health.