Ah, Xenia... they don't care much about calcium, but that's not important.
It is a "good" coral to start since it is pretty much all aquacultured nowadays. It can be a tricky coral though... since if not happy with the new environment, it can completely disappeared within days.
So go ahead if it is aquacultured, and your LFS does not charge you an arm and a leg for it. Don't be too disappointed if it disappeared.
IMHO, other softies are much better choice, such as mushroom and zoanthids. Some LPS are also good choice, such as frog spawn, but they typically need slightly more light than softies.