Gorgonians are a tricky lot, because their care varies greatly.  If you wont spend the time to feed, do not get a non photosynthetic!  They are much like suncorals, and will just fade away.  You will need to feed them at least a couple times a week, as mentioned prior.  Photosynthetic gorgonaians are typically very hardy, though, and can grow very quickly.  I have a couple in my reef, and they do well, despite the angels periodically picking.  I was looking at some pics the other day, and my purple has probably tripled in size ofver the past 2 years.