The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, with some having orange and black stripes, while others are brown and white. They are swimming around green plants and a black pipe in the background. The fish are moving in different directions, some are swimming near the surface while others are closer to the bottom of the tank. The water is clear, and the lighting in the tank highlights the colors of the fish and the greenery.