Threadfin Butterflyfish

So far I've posted two clips of fish that look like butterflyfish so this time I'm posting the real thing. This is
Chaetodon auriga, the Threadfin Butterflyfish, so named for that very thin "thread" coming off its dorsal fin.

Also not a butterflyfish

No, this is a Moorish Idol (Zanclus cornutus) but you could be easily forgiven for this mistake.  It very closely resembles the Schooling Bannerfish (Heniochus diphreutes), the main difference being that Bannerfish are not as yellow and do not have as large and prominant black stripe behind the head. 





I followed this fast moving fellow hoping to get a nice side view, had to settle for just glimpses from above.