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Very happy you are passing it on!
I've noticed they are not staying together but i just assumed it was because the bronze were fully grown and the unkowns were young
anyways a bit off topic but heres the unkown:
Ian, your corys wouldn't necessarily stay together even if they were all the same species. Shoaling is normally defensive behaviour in fish, and a typical shoaling fish (say a neon tetra) will quite happily swim around alone, leaving its cousins behind, so long as it doesn't feel threatened in any way.
The reason we need to keep, for instance, 6+ of any species, is because just the lack of 'cousins' to fall back on will make the fish feel insecure.
In short, it may well be perfectly normal behaviour they are displaying. The real test is when they feel threatened.
edit: I 100% agree about pets at home.