The video shows a group of red fish swimming in an aquarium. The fish are of various sizes and are seen swimming around the tank, which is decorated with rocks and plants. The water is clear, and the fish are moving around freely. The aquarium appears to be well-maintained, with no visible algae or debris. The fish are vibrant in color, with some having more red hues than others. The lighting in the aquarium highlights the fish and their surroundings, creating a peaceful and serene environment.