The video shows a close-up of a Betta fish swimming in a tank. The fish has a vibrant coloration with a mix of yellow, blue, and red hues. It has long, flowing fins and tail that are predominantly yellow with blue and red edges. The fish moves gracefully through the water, occasionally fanning its fins and tail. The background is blurred, but it appears to be a clear tank with a light source reflecting off the water's surface.