Coral Flatworms are found in tropical Indo-Pacific coral reefs, including Indonesia, the Philippines, and the Great Barrier Reef. They live directly on the surface of corals, feeding on their mucus and organic particles, and increasing coral health, but in large numbers, it may stress coral colonies. Coral flatworms contain symbiotic algae, meaning they acquire energy from photosynthesis. During population blooms, they can cover coral surfaces, blocking their light and reducing their ability to photosynthesize