reef safe? eh, maybe. depends on the fish and depends on the reef. if you ask my acans, no they're not. my cbb likes to munch them. doesn't seem to bother other corals or clams though.
easy to keep? like ThRoewer indicated, that's subjective.
if you get a healthy one that eats well, give them a few small feedings a day (2 - 4 for my tank, usually totaling about 1 full cube of myses, and the occasional treat of live white worms), keep the water quality high, and make sure they're not being harassed and have adequate room, they're reasonably easy to keep.
is it a fish that i would try to keep without at least a couple years experience? no, it is not.