The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, including yellow and blue. They are swimming around 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 surface while others are closer to the bottom of the tank. The aquarium appears to be well-maintained, with clean water and healthy-looking fish.