The video shows a close-up of a black and yellow fish swimming in an aquarium. The fish has a yellow stripe on its head and a yellow tail. It is swimming near the bottom of the tank, surrounded by rocks and coral. The water is clear, and the lighting is bright, highlighting the fish's colors. The fish moves slowly and gracefully, its fins gently propelling it through the water. The aquarium appears to be well-maintained, with healthy-looking coral and a clean environment.