Pink sea fans are formed from a colony of tiny polyps; they may be a deep pink to white in colour (3), and attach to the substrate with a broad base. Branches occur 2 to 4 cm above this base from a column which can reach 0.8 cm in diameter. Branching occurs in one plane, and the whole fan is orientated at right angles to the prevailing current in order to maximise the efficiency of filter feeding (2). The anemone-like polyps emerge from warty bumps along the branches (3).
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