Acanthogorgia isoxya
Genus narrowed down using this book link, page 35:
http://oseanografi.lipi.go.id/haspen/Gorgonian_Yosephine_1012cop1.pdf
It is similar to Acanthogorgia isoxya, according to this photo:
https://www.alamy.com/fan-coral-acanthogorgia-isoxya-crinoids-behind-them-image178763836.html
I am more convinced that this is the right species after seeing the picture in page 15 of Corals Indo-Pacific Guide by harry Erhardt and Daniel Knop.
Similar species: Soft Corals
By Patomarazul
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Uploaded Jul 19, 2020. Captured Nov 3, 2019 01:50 in Indonesia.