The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, with some being brown and others being white. They are swimming around a green plant and a rock structure. The water is clear, and the lighting is bright, highlighting the fish and their movements. The fish are seen swimming in different directions, sometimes coming close to the camera and other times swimming away. The aquarium appears to be well-maintained, with no visible debris or algae.