Nonphotosynthetic gorgonians are fairly difficult to keep alive in captivity, although more people are having success. You might want to check out the non-photosynthetic coral forum...I kept 3 Swiftia Exserta (orange w/ red polyps) and some caribbean nonphoto gorgs successfully (I had to break the tank down due to a move) and below are the keys, IMO:
1. Frequent feeding (primarily zooplankton and zooplankton subs) - the foods I had the most luck with were baby brine shrimp and rotifers (Reed's rotifeast is a good product), and depending on polyp size, many gorgs may accept cyclopeeze and Reed's arcti-pods. Fauna Marin also makes dry (granulated) foods for gorgs - Ultra Sea Fan and Ultra Min F are the best bets. Go for variety - golden pearls, oyster eggs, Kent Zooplex and TLF ZoPlan will be accepted too, and you might consider Coral Frenzy, Rod's, or some of the other mixed frozen foods that are available. Watch your gorg closely and make sure its polyps are catching the food and its actually being injested - they will spit food back out sometimes. Feed at least 1-2X per day...a continous feeding system is even better (See nonphoto forum for ideas).
2. Good flow is essential - it helps polyp expansion (and in turn, feeding) and helps keep algae from growing on them.
3. They don't mind light per se, but I preferred to keep them in relative darkness (or at least, under very blue lighting) to keep algae from growing on them. Algae can smother them, and if it has to brushed off constantly, it will stress them and interfere with their ability to feed.
Good luck!!!!