The video shows a group of fish swimming in an aquarium. The fish are of different sizes and colors, with some being white and others having spots or stripes. The aquarium is filled with clear water, and there are bubbles rising to the surface, indicating that the water is being aerated. The fish are swimming around the tank, occasionally darting towards the camera. The background of the aquarium is not visible, but there are some plants and rocks at the bottom of the tank.