I have to agree, it's much better to research first. When you're buying an angel it's important to make sure they're eating in the store -- many refuse to eat and don't make it. CBs are pretty tough as angels go, hopefully yours will be fine. They can also be coral nippers. Some never bother corals, other sample from time to time, and others just go to town and eat everything in sight.
They're beautiful, intelligent, territorial fish. They like to graze, so you may want to invest in a seaweed clip and some dried seaweed (nori from an Asian market or seaweed sheets from the LFS). They also enjoy meaty foods like mysis, and pellets. Mine eats just about anything, he's an absolute pig.