The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, and they are swimming around the tank. The aquarium is decorated with plants and rocks, creating a natural environment for the fish. The water is clear and the lighting is bright, allowing for a good view of the fish and their surroundings. The fish are moving around calmly, and there is no sign of aggression or distress among them. The video captures the peaceful and serene atmosphere of the aquarium, with the fish swimming gracefully through the water.