The video shows a group of fish swimming around in an aquarium. The fish are of different sizes and colors, including blue, orange, and yellow. They are swimming around the coral reefs and rocks in the tank. The water is clear, and the lighting is bright, making the colors of the fish stand out. The fish are moving in different directions, some swimming near the top of the tank while others are closer to the bottom. The coral reefs and rocks provide a natural habitat for the fish, and the overall scene is peaceful and calming.