The video shows two yellow fish swimming in an aquarium. The fish have long fins and tails and are seen swimming around the tank. The aquarium is well-lit, and the water is clear. The fish move gracefully, and their movements are smooth and coordinated. The aquarium appears to be clean and well-maintained, with no visible debris or algae. The fish seem to be healthy and active, and their vibrant yellow color stands out against the dark background of the aquarium.