Ed,
Your Regal is from the Red Sea/Indian Ocean area as it is yellow chested. Typically, these tend to acclimate to captivity easier, most likely due to better collection practices.
I had a Red Sea Regal for a year before I lost to an accident. It ate mysis, meaty foods, and blanched broccoli like a champ. I now have an Indo Pacific Regal which I've had almost a year. She has a blue/gray chest, and eats shrimp, scallop, mysis/meaty foods, and flake, but wont touch broccoli.....
IME, these fish do better with "dither" fish that are active eaters, but not aggressive. This encourages the Regal to eat things it may not recognize as food, without having to fight for it.
Nick