The video shows a group of fish swimming in an aquarium. The fish are of different colors and sizes, and they are swimming around the tank, sometimes coming close to the camera and other times swimming away. The aquarium appears to be well-maintained, with clear water and a variety of decorations and plants. The fish seem to be healthy and active, and there is no visible sign of aggression or stress among them. The lighting in the aquarium is bright, highlighting the colors of the fish and the details of the tank.