Sea Squirts

Found often in dense patches of cylindrical zooids, on drop-offs and walls of coral and rocky reefs.
They feed on plankton and detritus.
Height - ?cm
Depth - ?m
Widespread Indo-Pacific

Ascidian, also known as tunicates because their bodies are covered by a "tunic" a tough cellulose-like covering.
The other common name is sea squirt because when threatened they sometimes eject a jet of water.