I got a blonde naso from this site and it looked like that fish, only the blonde version. He/she is very timid and has only recently started to color up. Been since april I believe. It's not the most beautiful blonde naso, but is still very pretty. And is still quite timid. It would dart back into the rocks everytime anyone walked in the room. Darkening up when it did. But is slowly becoming more social. IMO that these are very timid, delicate fish and take some time to adjust to being yanked out of it's suroundings and acclimating to a new home. The reason for the dark coloration.