The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, with some being darker and others lighter. They are swimming around in the water, and their movements are smooth and coordinated. The tank appears to be well-maintained, with clear water and no visible debris. The fish are the main focus of the video, and there are no other objects or creatures present. The lighting in the tank is bright, allowing for a clear view of the fish and their movements.