This video captures a group of fish swimming in a tank. The fish are dark in color and vary in size. They are seen swimming around the tank, occasionally coming close to the camera. The tank appears to be filled with water and has a gravel-like substrate at the bottom. The lighting in the tank is dim, creating a somewhat murky appearance. There are no visible plants or decorations in the tank, and the fish seem to be the only inhabitants. The video does not contain any text or subtitles.