The Blue Peacock Cichlid (Aulonocara nyassae) is a freshwater fish known for its vibrant blue coloration and peaceful nature, making it a popular choice for aquariums. They are native to Lake Malawi in Africa and typically grow to about 4-6 inches in length. These fish are relatively easy to care for, requiring a 55-gallon or larger aquarium with plenty of rocks for hiding and a sandy substrate.