The video shows a group of fish swimming in an aquarium. The fish are of different colors, including yellow, black, and white. They are swimming around the rocks and plants in the tank. The water is clear, and the lighting is bright, highlighting the vibrant colors of the fish. The fish are moving in different directions, some swimming near the bottom of the tank while others are near the top. The aquarium appears to be well-maintained, with clean water and healthy-looking fish.