The Blue Peacock Cichlid or Aulonocara nyassae is a popular species of Cichlidto keep in an aquarium. These beautiful freshwater fish originate from Lake Malawi in Africa. The male and female Blue Peacock Cichlid are very easy to tell apart, unlike a lot of other fish. The male is bright yellow with metallic blues, while the female is a brown or gray, not nearly as brightly colored. Males will even become brighter when they are spawning.