I have Axelrod's Encyclopedia of Exotic Tropical Fishes book.
Boulenger (1906)
C. frontosa (7 bar)
"Recently therehas been considerable taxonomix revision done to this genus, which was once thought to be monotypic. We now know that there are no fewer than two valid species, with several more nominal species under investigation".
Takahashi et al (2003)
C. gibberosa
"Newly described species is made up of several populations..... care and husbandry is nearly identical to that of their cousins C. frontosa, with the only exception being that males are said to be more aggressive than their calmer cousins".
Axelrod & Scott (2005)