All guys, thank you very much.
I have kept two male specimens for a while and we described it with three specimens from Indonesia, around Medan and the depth range is said to be 10 - 20 meters, but it needs confirmation by divers. There probably is a shipper of marine aquarium fishes and tried to contact in vain. I once saw a male on a web of a shop in Sulawesi.
The coloration of displaying is not very clear but at least the tail turns brilliantly blue.
As far as agrressiveness it is a fairly peaceful fish, and did not fight one another. It is not coward; a very active fish and rarely hided into the crevices. It ate flake foods well and accepted almost anything.
Yes, it is very similar to C. joanallenae. Kuiter (2002) and Michael (2009) show it as C. joanallenae but no photos illustrated the dorsal fin fully extended. As you expect, C. naokoae is one of the members of C. rubriventralis- complex, including rubriventralis, joanallenae, and morrisoni. I miss females of naokoae; there is no information of young specimens.
The fish scarcely enters the aquarium trade and as far as I know only three individuals have been shipped to my country. Very fortunately I got two of them. Another individual was kept by a friend in Hong Kong who kindly provided the specimen to me and we used it one of the paratypes.
Please ask for the paper;
www.aqua-aquapress.com
