Sea Pen - Virgularia gustavian

This Sea Pen - Virgularia gustavian got its common name for its similarity with the olden days 'feathered pen'.
They can be found among sandy bottom, with the 'pen' protruding out of the sandy bottom. They usually play host to some crabs, shrimps and gobies. In the picture, a Porcelain Crab and a Goby can be seen.