The video shows a group of colorful fish swimming in an aquarium. The fish are of different sizes and colors, including blue, purple, yellow, and orange. They are swimming around the rocks and plants in the tank, creating a lively and vibrant scene. The fish are moving in different directions, some are swimming near the top of the tank while others are near the bottom. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish and their surroundings.