In the video, there are two fish swimming in a tank. The fish are dark in color with light-colored stripes on their bodies. They are swimming around the tank, occasionally crossing paths with each other. The tank appears to be made of glass, and the water is clear, allowing for a good view of the fish. The fish are of similar size and shape, and they seem to be healthy and active. The tank is well-lit, and the fish are moving freely without any visible signs of distress.