Yes, I have heard and read about how hard the Blue-bellied Regal is to keep.  I bought mine about a year and a half ago for $40.  It was about 3" when I bought it.  Now it is about 4".  It is housed in a 105 with a African Flameback Angel, live rock, feather dusters, shimps, and assorted mushrooms.  
Up until yesterday, Saturday, it was also housed with a Blonde Naso Tang and a Desjardinii Tang.  I took the two tangs to the LFS since they had gotten bigger than I felt comfortable with.  The tangs had started to look alittle cramped in my 105.  Now they are in a better home in a 250 gallon tank.
I feed all my fish Frozen San Francisco Bay Brand mysis shrimp, plankton, and Marine Cuisine.  I also feed O.S.I. Spirulina flake, and Ocean Nutrition Formula Two flakes.  I also provide them with Seaweed Selects Dried Nori Algea sheets. I normally feed flake in the morning and frozen food at night.  I rotate flakes and frozens so they are not getting the same meal everyday.