Welcome! Glad you joined. Going to defer to others on worm ID. Can tell it is a filter feeder, but its not a feather duster type worm based on its flexibility (unless its one I just don't know)... In general, worms MAY burrow into corals for protection, so IN GENERAL worms are (these days) not as highly regarded as once they were. GORGEOUS rock flower anemone by the way!
Have you considered starting your build thread? I found its a great place to document my tank's evolution for myself. I started tank first then joined, so I'm still finding myself going back collecting pictures & updating historically as well as current state. Once you create your first post in your thread and link it to your account, they will give you build badge (look left, under my ID)
This might help you find people local to you:
https://www.reef2reef.com/forums/local-reef-club-discussion.516/
This might help you find people local to you (are you in Sudan?):
https://www.reef2reef.com/forums/global-local-reef-club-discussion.634/
This is a good reference book type online article I still review:
https://www.reef2reef.com/ams/the-supreme-guide-to-setting-up-a-saltwater-reef-aquarium.84/
LOL - after watching the video - YES it really does!!!
If it isn't suitable for a reef tank, maybe setup a FOWLR tank and put it with peaceful fish as I think it seems cool! I remember when everyone LOVED feather dusters but now some will say they are reef tank 'pest'...