I agree. Only think the female is a juvenile and probably not ready to mate what makes the male (that is in mating color) quite irritated. I've seen this earlier with young females. Besides the tanksize the watertemp can be a trigger for the male to start reacting quite agressive.
Not long ago it is changed in Corydoras Splendens (though I like Brochis cause of the differences to the "old" Corydoras and Brochis is often still used)
There is constantly movement between Brochis / Corydoras / Aspidoras and between the different lignes of Corydoras.
Some (wildcaught) Corys...
Yes. The only one that could be doubted is the blue one (cause males and females are blue) as Colin said. The red in the blue ones tail and its behaviour tells it is male also though. The red one is 100% a male without the slightest doubt.
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