larger reef/invert safe fish??

[sharuq1]

My fiance wants one large fish for our soon to be 120g mixed reef. I need some ideas for a larger fish that will not eat coral, decorative cleaner/fire shrimp and not pick on or eat small fish. Critters that will be in the system are: royal gramma, clowns, sand sifting gobies, cleaner wrasse, mandarin, cleaner shrimp and fire shrimp.

I am thinking some kind of tang or butterfly? But I really don't know jack about them other than that tangs are ick magnets but vegetarians. Butterflies I have no clue at all and I worry that most of them would make a snack of my shrimp (I love shrimp, lol).