The video shows a blue fish swimming in an aquarium. The fish is seen swimming around the tank, exploring its surroundings. The aquarium is decorated with rocks and plants, creating a natural habitat for the fish. The fish appears to be healthy and active, moving smoothly through the water. The lighting in the tank highlights the vibrant blue color of the fish, making it stand out against the more muted colors of the aquarium decor. The video captures the peaceful and serene environment of the aquarium, with the fish being the main focus of the footage.