actually I think the Bronze Cories are one of the larger species.
Smaller ones are C pygmaeus (Pygmy Cory)--1 in, C panda (Panda Cory)--less than 2 in, and then C paleatus (Peppered Cory) I'm not sure about but I think they are smaller maybe. Look on planet catfish. I'll find the link to the cory page.
Yes thank you I knew about the pgymy but not peppered cory and panda won't really work for me because they to be in groups of 8. Yes I know about planetcatfish though thanks for the link, I was just wondering if anybody could tell me real quick some of the smaller species, thanks.
Sorry actually paleatus aren't that small, they're almost 3 in, I don't know why I though they were small.
Also I forgot to add C hastatus which is another type of pygmy Cory.
Pandas do just fine in groups of 3, just like any other Cory. As far as I know the only Cories that are better kept in larger groups (6+) are the pygmies, pygmaeus and hastatus, because they are more like regular shoaling fish than the other Cories in their nature. They are more of mid water swimmers and very shy and group oriented.
I don't know of any other small Cories off hand but if you had time you can go through and find the size of all the Cories on the planet catfish link. Or maybe I'll do it sometime when I'm bored. A list of smaller Cories would be nice to have for people with smaller tanks.