What fish can you keep with cardinal tetras?

Cardinal Tetras are from the very tropical, acid waters of the Amazonian Rainforest. Almost any small fish species that comes either from the same area or places that have similar water conditions should be OK with them. The species that come to mind are most Tetras, DaniOS, Barbs, Rasboras, Corydoras, and most of the Dwarf Amazonian Cichlids like Rams etc.