Oh, I know that Kribs are come from "soft" rivers, but I usually like to keep fish from similar areas together. If I threw in some, say bleeding heart tetras, it would constantly bother me that I had fish from S. America and Africa in the same tank. Nuts, I know.
Also, I'd rather go for the Tanganyika tank, but I have to get the Kommisar (if you catch my drift) to approve the funding. So the krib tank idea would be a back-up plan.
So, congo tetras are too big. I wonder what else is out there...