The video features a close-up view of a coral reef in an aquarium. The reef is home to a variety of corals and fish, including a blue tang that swims in and out of the frame. The corals come in different shapes and colors, with some resembling brains and others resembling branches. The blue tang fish has a bright blue body with a yellow tail and black stripes. The reef appears to be healthy and well-maintained, with clear water and no visible signs of damage or disease.