The video shows a close-up of a fish tank with a large fish swimming around. There are also many small fish swimming in the tank. The fish are of different sizes and colors, and they are all swimming in different directions. The water in the tank is clear, and there are plants and rocks visible in the background. The large fish is the most prominent feature of the video, and it appears to be a type of freshwater fish. The small fish are likely a type of tropical fish, given their bright colors and patterns. The video does not contain any visible text or subtitles.