The video features several fish of different sizes and colors swimming in an aquarium. The fish are seen swimming around green plants and near the glass walls of the tank. The aquarium appears to be well-maintained, with clear water and no visible debris. The fish are seen in various positions, some swimming alone while others are in groups. The colors of the fish range from bright orange to dark blue, with some having patterns or spots. The plants in the aquarium are lush and green, providing a natural habitat for the fish.