Could be Menella, non-photosynthetic gorgonian, one of the best - if not the best

Usually it has yellow polyps, sometimes - purple, but I was told that it could be blue too.
This one is similar, but lighter colored branches.
This is not a purple frilly gorgonian, Pseudopterogorgia - different shape and color.
Search by name will show how others keep it. Almost every NPS corals keeper has it.
I have (what I believe is) a purple menella, but could be Paramuricea clavata. Diodogorgia, swiftia and muricella were easier, but menella is alive and as long as it is fed - it is open. Prolonged feeding is preferable.
Maybe Fauna Marin foods or RotiFeast and PhytoFeast are what it prefers.