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Chaetodon capistratus
Argh for some reason it didn't like it when I put the link with the suggestion, so here it is! http://www.fishbase.org/summary/speciess...
Great picture, I love butterfly fish! These guys are called foureye butterfly fish (since they have two eyes and two eye spots!). I'll leave a suggestion so you can see the link to the FishBase entry :)