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Sorry, didn't see your comment. Also, which cory species interbreed? As far as I know corys of different species don't interbreed and most of them don't shoal together if there are of different type though you can see them eating together of course.
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i dont know some off the top of my head, but ive seen videos on youtube of hybrids, and ive seen tanks and videos of multiple species of corys shoaling together and lying on top of each other, and just messing around like they do with their same species
the only ones i would try as a centerpiece fish (most common, and the ones ive tried) are bettas, gouramis, and GBR cichlid( they require pristine environment and a tank that has been running for a long time)sorry but i dont really know any others, except maybe scarlet badis, idk how they would do witht ehother fishes though, they are realy small and might get eaten or harassed