Well, they're fairly hardy (this thing was absent most color and very shrivled when I got it), need PC or better lighting. Good water conditions, though some have been known to do well in slimy water, or so I'm told. They feed via small tentacles, and have been known to consume whole (small) fish. I feed mine a spray of brine, or finely chopped krill. I use C-Balance every day, with some additional supplements.
I have the Julian Sprung coral book and Aquarium Corals for references on them....
Here's a better focus pic of the feeder tentacles: