seaweed is vital to this ecosystem

Even though coral reefs occupy less than one percent of the ocean floor,these dense ecosystems are home to more than twenty-five percent of marine life.Many fish use corals as shelters for sleeping and to hide from large predators between their trips foraging for seaweed.As the primary food source for many of the reef fish and invertebrates,seaweed is vital to this ecosystem.But in high densities, seaweed can become problematic,and even lethal to corals.