The video shows a group of small fish swimming in an aquarium. The fish are mostly green with some blue and black spots. They are swimming around a bed of small pebbles that cover the bottom of the tank. The water is clear and there are no other objects or decorations in the tank. The fish are moving around freely, some swimming near the surface while others are closer to the bottom. The lighting in the tank is bright, making the colors of the fish stand out against the neutral background.