The Brain Coral has a purple, hemispheric body. The bubbles are released from the circular protrusions with green holes in them that cover the body of the Brain Coral.
Brain Corals produce bubbles at day and at night.
Data Bank Entry
A permanent, growing colony of microscopic organisms. This coral species has adapted to filter carbon dioxide from the environment, using the carbon to build the colony, and expelling the oxygen from specialized exhaust funnels. It is quite hardy, suggesting samples from a mature specimen could be grown artificially.
Assessment: Air tanks are equipped to siphon oxygen from the water where possible