Just beware that Pseudos are really territorial, and can be nasty little buggers. If you're planning on adding add'l fish, you might want to add that one last in a tank that size.
No more than 1, and it won't get along w/ similar fish like grammas, etc.
IME, Pygmys and Coral Beauties are among the more reef safe angels, but almost all angels are a risk as Spanko points out. It varies widely from one individual to another.
The CB will also outgrow the tank, and I haven't seen many that are suitable size for a 29 to start with. It's a fish that I'd also prefer to buy in person, as the coloration varies quite a bit.