The video shows a group of colorful fish swimming in a tank. The fish have different patterns and colors, including blue, orange, and yellow. They are swimming around the tank, some of them are near the bottom while others are near the top. The tank has a yellow bottom and a blue background. The fish are moving in different directions, some are swimming together while others are swimming alone. The video is shot from above the tank, and the fish are the main focus of the video.