The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, and they are swimming around in the water. The tank appears to be well-maintained, with clear water and no visible debris. The fish are moving around calmly, and there is no sign of any other creatures in the tank. The lighting in the tank is bright, and the fish are clearly visible. The tank seems to be indoors, as there are no windows or natural light sources visible in the video.