615 Gal (imperial) reef safe centre piece fish (large)

[FishOkay]

I'm looking for a large centre piece fish for my 615gal tank (imperial), 730 Gal for you US folk I believe
Reef safe is a must. Especially clam safe! Would appreciate some suggestions?
I currently have;
Yellow tang
Purple tang
Mustard tang
Regal tang
Small juvenile Lipstick tang
Swallowtail angel pair
Clownfish pair
Filefish
Fire fish

 

[Troylee]

Blonde naso tang are nice if you can find a healthy one! They get large.