The only one that I am aware of is zooxanthellae, but there may be several species found in corals.
there is no animal can survive
Living coral must remain relatively close to the surface of the water so that the symbiotic algae can have access to sunshine. The algae requires sunshine in order to complete photosynthesis which provides oxygen to the coral.
I am kinda positive that algae is a symbiotic factor.
symbiotic algae
Red/pinkish.
Coral and algae (specifically the algae called zooxanthellae) have an intimate symbiotic relationship. The algae live inside the coral, and provide it with sugars and other photosynthesis byproducts. The coral provides the algae with nutrients for photosynthesis and a safe place to live and reproduce.
Many corals, specifically hermatypic corals, contain symbiotic algae that provide the coral with sugar from photosynthesis. Algae also feed zooplankton, which corals feed on. Basically, algae provide corals with food, indirectly.
Algae are in a symbiotic relationship with coral.Parrotfish, butterfly fish, angelfish, sea slugs, snails, worms and the crown-of-thorns starfish all eat coral.
Coral polyps and Zooxanthellae. They have a symbiotic relationship with each other. The coral polyps provide a home for the Zooxanthellae (a type of algae) and the Zooxanthellae provide the polyp with food and gives the coral its recognizable color. Without the Zooxanthellae, coral bleeching occurs.
I am not aware that any scientist considers coral bleaching to be advantageous; bleaching indicates the death of symbiotic algae within the coral, leading to the death of the coral itself, leading to a greatly reduced oceanic biodiversity, which is a bad thing.
Almost all coral are predatory, meaning that they capture prey from the water column; this prey is small zooplankton organisms. Some corals also contain a symbiotic algae, called zooxanthellae, that produces sugars and releases some of the sugar to the coral.
The algae helps the coral by producing oxygen and other nutrients that are required by the coral. The coral produces carbon dioxide for the algae as well as other substances the algae requires.