The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, including blue, yellow, and gray. They are swimming around a fake tree and green plants. 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 surface. The aquarium appears to be well-maintained, with clean water and a healthy environment for the fish.