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It's not a snake eel (Ophichthidae) but a type of moray (Muraenidae). I'm just going through my literature to pin the name down - I hate it when I remember seeing a photo of a species, but can't recall where (or what it was called). Hopefully it will come to me soon.
I'm not hugely confident that it's the species I was thinking of, but Gymnothorax enigmaticus is close. If it's not G. enigmaticus, it's another species in that complex.