“There are many corals that are not algae-assisted, but all reef-growing corals are. They need the extra energy generated by the algae's oxygen and sugars to grow fast enough to combat all the forces that work toward reef destruction.” OceanReefsAlgaeCoral Book:The Reef: A Passionate History: The Great Barrier Reef from Captain Cook to Climate Change Source: The Reef: A Passionate History: The Great Barrier Reef from Captain Cook to Climate Change