Well, it certainly pointed me to the right direction, Gerardo. Now I think I'll be able to identify other sea anemones as well, thanks to your ID suggestion. :)
Actinodendron sp. check this Photos is one just like yours.
http://www.nevillecoleman.com.au/gallery/image-subgroups/subgroup-listing.aspx?ImgSubGroupId=8275
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