black Volta typically have very large block type markings. The supplier who brought these in for my LFS could only say they're wild caught from Nigeria. King EL assisted in ID'ing these based on the physical traits, and going by exporting trends through the years.
You once asked King EL for his opinion about your Black Volta. Hope you don't mind me sharing your pic of old. Your recent BV update you had looks great! Post your awesome BV update here if u want