Juvenile Puffer/Toby from Madagascar

I'm trying to identify this juvenile puffer? He was quite small (maybe 2-3cm, possibly smaller), as you can see by comparing him to the whip coral he's hanging out near. I believe I was around 50-60ft at the time of the photo, diving in the Nosy Be area. My best guess is that this is a juvenile Canthigaster valentini, AKA Valentinni's Sharpnose Puffer, but I'm far from confident. Hoping one of the experts here can help to confirm!

Not a juvenile filefish is it?

Juvenile mimic filefish, Paraluteres prionurus.

By coincidence, I just happened to spot a very similar fish and whip coral as one of the winners in the Ocean Art competition. That photo from Lembeh is identified as a filefish:

http://www.uwphotographyguide.com/oa14-3rd-macro

Wonderful! Thank you all so much for the assistance. I really appreciate it!