The rust colored column/foot on your anemone and the way it's holding itself in the first couple pics make the ID of BTA pretty much 100%.
H. crispa (sebae) will hold itself like that sometimes but it would never have that color base and you would be able to see the verrucae on the underside. A H. magnifia might have that color base but it wouldn't hold itself like that and the tentacles wouldn't look like that.