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 rocks and plants in the tank. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish and their surroundings. The fish seem to be healthy and active, moving around the tank with ease. The rocks and plants in the tank provide a natural habitat for the fish, and the overall atmosphere of the video is peaceful and calming.