The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, and they are swimming around the tank in a lively manner. The tank is decorated with plants and rocks, creating a natural habitat 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 in different directions, some swimming near the surface while others are deeper in the tank. The video captures the beauty and tranquility of the underwater world.