The video shows a group of small fish swimming around in a tank. The fish are mostly green and yellow in color, and they are swimming around a white cylinder that is floating in the water. The tank appears to be well-lit, and the water is clear, allowing for a good view of the fish and the cylinder. The fish are of various sizes, but all seem to be relatively small. The cylinder is white and has some writing on it, but it is not clear what the writing says. The fish are swimming in different directions, some are near the cylinder while others are further away. The video does not show any other objects or creatures in the tank.