That is a beautiful sea fan... I've seen similar ones that are photosynthetic, but they tend to be yellow or purple, not that gorgeous burgundy that you have.
If it's opening a few times a day, that should be good enough... I don't know anyone that's had many nonphotosynthetic gorgonians. If you notice any bad decay, I've heard that it can travel down the stalk and kill the whole piece. I would trim off any decaying or dead parts, maybe take a small frag and put it in a different position in the tank just in case you lose the mother colony.
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Calvin
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Planning a 29 gallon mixed reef...
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