Soft corals have eight tentacles per polyp although rare mutations or aberrant polyps have been reported.
Capturing a polyp in macro (picture) should help you confirming it as Octocarallia (Alcyonaria).
Most soft corals polyps have side branchlets called pinnules on each tentacle. The pinnules are what make the tentacles look like little feathers or palm fronds. Yours seem to comply with these caracteristics.
I belive your specimen is a Chironephtya whose common name is Dendronephtya. Other similar looking species are Nephthyigorgia and Siphonogorgia. I suggest you explore these ones as well.
In case you confirm yours as such, here's the info I have on Chironepthya sp.:
It comes from East Africa to Western Pacific region.
Non-photosynthetic branchy soft corals with appereance somewhere between gorgorians and Dendronephthya, whith brightly colored spicules and polyps. In some species drooping branches arise from an upright stalk, in others the entire colony is upright. The branches are stout and end abruptly without tapering off. Polyps are most concentrated at the ends of the branches, located in spiny calyces, with thick and large sclerites. Able to expand with water or deflate into a small tangle of stiff branches.
This species has ZERO lighting needs and therefore is suited to be placed at the lower end of the tank but not directly in the sand substrate. It could be placed into a crevice in
live rock, be it completely shadowed or receiving some light.
The water flow requirements is from moderate to strong (not extremely strong neither mild).
This coral is considered non-aggressive and should be protected from aggressive tank-mates.
It is considered a delicate species (not hardy).
Note: Most relevant info provided here by me comes from Julian Sprung (1999) "Corals: a quick reference guide", Ricordea Publishing, Florida.
Pepetj
Santo Domingo
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