The video shows a group of colorful fish swimming in an aquarium. The fish are of different sizes and colors, including red, blue, and orange. They are seen swimming around a rock and a piece of wood in the tank. The aquarium is filled with small pebbles on the bottom, and there are some plants visible in the background. The fish are moving around the tank, sometimes swimming close to the camera and other times hiding behind the rock or wood. The lighting in the tank gives the fish a vibrant appearance, and their movements are smooth and graceful.