The video shows a group of fish swimming in a tank. The fish are of different sizes and colors, including orange, yellow, and green. They are swimming around the tank, some near the bottom and others near the top. The tank appears to be well-lit, and the water is clear. The fish are moving in different directions, some swimming solo while others are in groups. The tank seems to be a home aquarium, and there are no other objects or decorations visible in the video.