The video shows a large fish swimming in a tank with a smaller fish. The larger fish is dark in color, while the smaller fish is light pink. The smaller fish is swimming around the tank, and the larger fish is following it. The tank appears to be well-maintained, with clear water and no visible debris. The larger fish seems to be interested in the smaller fish, as it follows it around the tank. The smaller fish appears to be unaware of the larger fish's presence and continues to swim around the tank. The video does not contain any other objects or creatures, and the focus is solely on the interaction between the two fish.