The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, with some being darker than others. They are swimming around in the water, occasionally coming close to the camera. The tank appears to be well-lit, and the water is clear, allowing for a good view of the fish. The fish are moving in different directions, some swimming up and down while others are side to side. The tank seems to be a home or office setting, and there are no other objects or people visible in the video.