Protomelas sp. 'Steveni Taiwan' or Taiwan Reef Cichlid.
Dominant males are beautifully coloured, whereas females retain the drab olive and brown juvenile colouration. Males begin to colour at around 5 cm in length, the head will begin showing a blue colouration, spreading throughout the fins. Males showing exceptional colour at this size are most likely hormoned and should be avoided. At approximately 10 cm in length, the dominant male will have mostly adult colouration, intensifying as he ages. A male usually does not show full colour until 2 years of age.