Plerogyra sinuosa

Commonly known as the Bubble Coral or Bladder Coral, is a species of large-polyp stony coral (LPS) and characterized by their distinctive large, round polyps with a bubbly appearance. The coloration of Plerogyra sinuosa can vary widely, including shades of green, brown, and even fluorescent colors. The coloration may be influenced by the lighting conditions and the health of the coral. During the day, the polyps (the bubbles) expand to expose their tentacles for feeding. At night, they retract to protect themselves. Plerogyra sinuosa attaches themselves to the substrate, and their skeletons provide support for the fleshy polyps. Like other corals, Bubble Corals are carnivorous and primarily feed on zooplankton and other small organisms. They also derive nutrients through photosynthesis, as they have a symbiotic relationship with photosynthetic algae called zooxanthellae.

This coral in the colored image is soft yellow and it was a huge colony. Coral bleaching doesn't necessarily mean the death of coral reefs, but it does weaken them and makes them more susceptible to other threats, such as diseases. If the stressors causing bleaching persist, corals may die. However, if the stress is temporary and the environmental conditions improve, corals can recover by regaining their symbiotic algae.