I saw them on a show on Discovery or NGC. They keep their mouths open for food to come inside and when the host touched them they closed themselves. He told the name. My bad...I forgot.
It's very similar to these two aggregating anemones but a different species I think:
http://www.projectnoah.org/spottings/7143979
http://www.projectnoah.org/spottings/7896551
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