The video shows a group of small fish swimming in a tank of water. The fish are yellow in color and are of the same species. They are swimming around the tank, occasionally coming close to the camera. The water in the tank is clear, and there are bubbles visible on the surface. The background of the tank is dark, which contrasts with the bright yellow color of the fish. The fish are moving in different directions, but they all seem to be swimming in the same general area of the tank.