The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, but they all have a similar shape and pattern. They are swimming in different directions, some are going up, some are going down, and some are going sideways. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish. The background is a solid blue color, which contrasts with the fish and makes them stand out. There are no other objects or creatures visible in the video.