Heniochus diphreutes or Heniochus acuminatus?

[Swedereefer]

first of all i wish you all a happey reefing x-mas from the north pole and i hope you can gimme some help here, what kind is it i just got?

 

[GHsaltie]

Acuminatus would be my guess. Can you get another picture without the smudges?

 

[Swedereefer]

slightly better i hope

 

[Swedereefer]

another one, and plz. point out what makes the diff

 

[GHsaltie]

From what I read the best way to tell the difference is the anal fin. With diphreutes the back edge of the anal fin goes straight down at a 90 degree angle from the base of the tail. The back edge of the anal fin on acuminatus angles down. That last picture makes me second guess myself though.

 

[saltyhog]

Looks like accuminatus to me. The shape of the anal fin is the best way for me to tell them apart. H. dephreutes has an almost 90 degree angle on the anal fin from the base of the tail. H. accuminatus is more rounded and comes to a point.

The last picture is a little misleading. If I only saw that one I'd say it was a toss up.

Where did the specimen originate from?

 

[saltyhog]

From what I read the best way to tell the difference is the anal fin. With diphreutes the back edge of the anal fin goes straight down at a 90 degree angle from the base of the tail. The back edge of the anal fin on acuminatus angles down. That last picture makes me second guess myself though.

Beat me to it!

There are a couple of places where the two fish's ranges don't over lap. One of those is Hawaii which has H. diphreutes but not H. accuminatus.

 

[Swedereefer]

i have no clue about origin

 

[Swedereefer]

 

[saltyhog]

Beautiful fish. Definitely H. accuminatus. Best of luck with him/her.

 

[Swedereefer]

thx, was curious about if she (i have desided that it´s a She) would pick my corals, but this is my "leftover tank" wich is in my humble opinion turning out just great, but with just a few seriosly fried SPS and she have not even touched them, but then she have only been here for a few hrs. until sundown, knock on ...

 

[don_chuwish]

Beautiful fish. I really want one H. diphreutes but never see anyone carrying them.

 

[Swedereefer]

well she started to strip a Caulastrea today so now i know who she is
moved the coral to another tank, still love her

 

[saltyhog]

Sorry to hear that but pretty predictable. H. diphreutes is the only one in that genus thought to be reef safe.

 

[Swedereefer]

BUSTED! -no not really, i had a LPS that was going to die as it seemed so why not let the fish be happy
https://www.youtube.com/edit?video_id=1g4ViS1VeIY&video_referrer=watch

 

[don_chuwish]

Found this good link off Wikipedia for seeing the difference. Unfortunately if you search Google for images it just gets confusing because I think so many are mislabelled or at least not good representation of either:
https://en.wikipedia.org/wiki/Schooling_bannerfish#/media/File:Moorish-pennant-bannerfish.jpg