green star polyps and yellow star polyps are great first corals, as are most leathers (toadstool, finger, etc). I would also get a variety of mushrooms (blue, orange, red, green striped, etc).
FYI, the kenya tree (capinella) I added just the other day was ritualistically abused by all my angelfish. They took turns ripping the SNOT out of it. It currently lay at mangled at the bottom of the tank, but there is one piece that has buds and may pull through. If it does, I will consider them the Lazerus of corals.
-Dr Marco :sfish: