Talk:Brain Coral/@comment-33237856-20171221002912/@comment-33330791-20180906014401

TDplay also the red grass and microscopic algae produce oxygen. This would explain how the ghost leviathans in the dead zone survive. Plankton algae produce oxygen. And in the primary aquarium, the Sea Emperor, as well as the other fish, produce plenty of CO2 for the brain coral.