The video shows a group of fish swimming in an aquarium. The fish are of different colors and sizes, and they are swimming around the tank, which is decorated with rocks and 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, and the fish seem healthy and active.