The video shows a fish swimming in a tank with a coral reef background. The fish is moving around the tank, and there are small white particles floating in the water. The coral reef background is colorful, with red, green, and blue hues. The fish is the main focus of the video, and it appears to be a tropical species, possibly a cichlid. The water is clear, and the lighting is bright, highlighting the details of the fish and the coral reef.