Thanks, we went to a LFS near the OH's parents and they had black cories in, just labelled as 'black cories' just wanted to see if there was more than one strain that were black.
"The Blacks" are C. schultzii and were developed by a breeder. There is also a variety of wild Cory that is the Venezuelan that was mentioned. It may be C. aeneus.
I have 5 of Frank's Blacks. They are stunning.
I understand that Sp00ky has had them for sale, also. Alex and Carmen have some from him.