The video shows a large fish swimming in a tank with a smaller fish. The larger fish has a long body and a pointed snout, while the smaller fish has a more rounded body. The larger fish is dark in color with a patterned body, while the smaller fish is light in color with dark stripes. The tank appears to be made of glass and has a greenish tint. There are no other objects or creatures visible in the tank. The larger fish moves slowly and gracefully, while the smaller fish swims around energetically.