The video captures a fish swimming in an aquarium. The fish is predominantly black and yellow in color, with a slender body and a pointed snout. It swims gracefully among the green plants in the tank, which are of various shapes and sizes. The aquarium appears to be well-maintained, with clear water and no visible debris. The fish moves effortlessly through the water, occasionally brushing against the plants. The lighting in the tank highlights the vibrant colors of the fish and the plants, creating a serene underwater scene.