The Dickfeld's Julie Julidochromis dickfeldi is the most recently discovered of the three dwarf Julies, described by Staeck in 1975. This dwarf Julie only grows to a length of 4 1/3 inches (11 cm). However it is not quite the smallest, its relative the Masked Julie Julidochromis transcriptus is the dwarf cichlid with that distinction at about 3 inches (7.62 cm) in length. The Golden Julie Julidochromis ornatus is also smaller, reaching just over 3 inches (8 cm), and has the distinction of being the first of the Julies to be bred in captivity. Like these others, the small size of this cichlid does make it easy to house in tight quarters and a 20 gallon tank is perfect for keeping a pair.
http://animal-world.com/encyclo/fresh/cichlid/DickfeldsJulie.php