Phenacogrammus

P. interruptus are quite sensitive to water quality and if a high standard is not maintained the development of the males' fins may be impaired and the fish will lose colour. They are also quite an easily frightened fish, particularly if they are not maintained in numbers. This species is most often seen for sale as a fairly drab, greyish 1 1/2" fish and is often overlooked. However once they are settled into the aquarium and have begun to mature they develop spectacular colouration. ...