Whatever it is, it will be one huge tang. Much bigger than most reeftank.
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
It is darker than I would expect for a chirurgus but I cannot rule it out. To be honest with acanthurus tangs I hear are several that as juveniles they’re very very difficult to ID. Some as adults can be difficult (Fowleri, barienne, dussumeiri, etc).Seeing it coloured up, I’m pretty sure it’s actually an Acanthurus chirurgus - The Doctorfish Tang.
These are another that when they’re not coloured up they can look similar to Blochii.