In the video, there are two fish swimming in a tank. The fish are of different colors and sizes. One fish is larger and has a mix of orange and black colors, while the other is smaller and has a mix of brown and black colors. The tank is filled with water and has some green plants and a black pipe in it. The fish are swimming around the tank, occasionally coming close to the camera. The larger fish is seen swimming near the smaller fish, and at one point, the smaller fish swims near the pipe. The water in the tank is clear, and the fish are moving smoothly.