If you get a picture of the column, then we can tell for sure but from the tentacles, it looks like a Haddoni. Haddoni tentacles also move in still water like that in this video.
like Minh posted, we need to see the column.
the anemone in the vid is stressed. I've seen haddoni look and move like that.
to be honest... everything I've seen up to this point indicates haddoni to me...
Looks 100% haddoni to me. Show us the column for the win! For that matter, show us the edge of the oral disk instead of all of these shots of the mouth.