The video shows a group of fish swimming in an aquarium. The fish are of different colors and sizes, and they are swimming around a rock formation. The water is clear, and the lighting is bright, highlighting the vibrant colors of the fish. The fish are moving in different directions, some swimming near the surface while others are exploring the rock formation. The aquarium appears to be well-maintained, with no visible algae or debris. The fish seem to be healthy and active, and there is no visible sign of aggression or stress among them. Overall, the video provides a peaceful and calming view of the underwater world.