The yellow sun coral (Tubastraea aurea) is a brightly colored coral that is only found inside the caves and crevices of coral reefs in the Indo-Pacific Ocean. This coral is sensitive to sunlight and needs darker locations to thrive. The coral polyps lack the symbiotic algae that grow inside many other coral species. Sun corals belong to a group of corals known as large-polyp stony or LPS corals. This means that while they produce a hard skeleton, they do not contribute to building reefs.