Introducing Big Mac (acanthurus maculiceps). The stars aligned and for whatever reason I found one right after deciding I wanted one. I've only ever seen one more in person (same LFS a few years ago). He was very shy at the LFS and after giving him a couple days there to come out of hiding (he never did... in with some triggers that didn't like him) I took him home early. Turned out to be the right choice so far.
I added him to the tank and he did a full sprint into the glass at one end and turned around and did it one more time. Ok... HALIDES OFF.
This fish can change colours! The first two were shortly after adding him, next two getting comfy in his cave, and last two cruisin'! I had to sit in the shadows about 10 feet away and with only the T5s on it's tough to shoot with my slow zoom lens:
Didn't even realize the filefish was in frame. So easy to not notice the creep.