Horals can grow up to 2m long and wide, and up to 1.5m high.
Seawater is pumped through channels within them. Small plankton are digested here. Oxygen and ions are also absorbed, and taken up by the cells.
Nutrients are sent to the Fanisid cells, allowing them to grow, live and reproduce.
When Horals grow large enough, a small section breaks off. It is carried by the current to a new location, where it cements itslef then begins to grow.