I have an aquarium with 2 corydoras in a 20-gallon, among other fish as well, but as far as schooling, these fish don't seem to school or even care to stick together. I have corydora species together in groups of 5, 7, 8, and 12 and they all pretty much stick to their self. Hence, I do not feel bad for my pair of cories in the 20 gallon.
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