The video shows a group of fish swimming in an aquarium. The fish are of different species and colors, including orange and black. They are swimming around the tank, which is decorated with green plants and a black background. The fish are seen swimming near the bottom of the tank, around the plants, and near the surface of the water. The tank appears to be well-maintained and clean, with clear water and no visible debris. The fish seem to be healthy and active, moving freely throughout the tank.