The video shows a group of small fish swimming in an aquarium. The fish are mostly grey in color, with some having yellow tails. They are swimming around and between various rocks and shells that are scattered throughout the tank. The rocks and shells come in different sizes and colors, including brown, green, and white. The fish are moving in different directions, some swimming towards the camera while others swim away. The water in the tank is clear, and bubbles can be seen rising to the surface.