Mii
(NOTE: this may not apply to pygmy corys as they look and behave differently than the normal corys. I am only talking about regular 'ol run of the mill standard corys such as bronze, peppered, panda, etc)
I originally posted stating that you can mix corys and they will all school and socialize with each other, but some people in the replies have informed me that their corys didn't school together when they mixed them. So i am going to take back the statement that you CAN mix corys and that they will always school, and say that you might be able to mix corys and they might school but it varies from case to case. I'm still going to continue mixing corys as when getting pairs of each species they didn't seem to have any preference for their own kind over other corys in terms of social interaction, they all socialized just fine. I'd also like to say that there's a difference between being being social with each other, and swimming together because they rely on "safety in numbers". When socializing they will touch each other, and really seem like they're happy to be around each other, meanwhile if they're just following each other around they're probably just doing it because they feel safer in groups and aren't really very interested in each other. I'd recommend getting pairs of each species and if they treat the other species the exact same way they treat their own species (with the exception of breeding behavior as I'm not sure corys can or want to hybridize). Or if they seem to have a preference for their own kind and be more social, and just sort of follow the others around. If they do seem to have a preference for their own kind you should probably bring the others back and get a school of just one species. I guess it varies from case to case.
I originally posted stating that you can mix corys and they will all school and socialize with each other, but some people in the replies have informed me that their corys didn't school together when they mixed them. So i am going to take back the statement that you CAN mix corys and that they will always school, and say that you might be able to mix corys and they might school but it varies from case to case. I'm still going to continue mixing corys as when getting pairs of each species they didn't seem to have any preference for their own kind over other corys in terms of social interaction, they all socialized just fine. I'd also like to say that there's a difference between being being social with each other, and swimming together because they rely on "safety in numbers". When socializing they will touch each other, and really seem like they're happy to be around each other, meanwhile if they're just following each other around they're probably just doing it because they feel safer in groups and aren't really very interested in each other. I'd recommend getting pairs of each species and if they treat the other species the exact same way they treat their own species (with the exception of breeding behavior as I'm not sure corys can or want to hybridize). Or if they seem to have a preference for their own kind and be more social, and just sort of follow the others around. If they do seem to have a preference for their own kind you should probably bring the others back and get a school of just one species. I guess it varies from case to case.