Coral reefs host incalculable amounts of life - providing a home, food and shelter for an array of marine organisms. With the naked eye - thousands of specimens are visible. But what about the organisms too small to ever notice? What part do they play in maintaining our oceans? Vital to life on earth, micro-organisms allow for the immense biodiversity found across our oceans. Feeding on organic waste, and forming the very foundation of our food chain, these microscopic creatures play a role so important that entire ecosystems would completely collapse without them.