07-05-2007, 08:08 AM
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Hi. There is no way to answer that question, other than to say, they may shoal, some may shoal while others peel-off, or they may not shoal at all. Each group will react differently to it's Cory tank mates and the various parameters (water, lighting, hiding places, other species in tank, etc.) that is their enviroment. If you ask a dozen people - you'll get a dozen answers.
It is best to keep Corys in groups of at least 5 to 6 for their comfort and security.
Just my 2¢. - Frank