The video shows a dark, murky aquarium environment. Several koi fish are visible swimming. One large, dark-scaled fish with a black tail is prominent in the foreground, swimming towards the right. Another orange koi is visible swimming towards the left in the background. A lighter-colored fish, possibly white or light tan, is in the middle ground, swimming towards the left with its fins extended. A smaller orange koi is also present in the background, swimming towards the left. The bottom of the tank appears to be sandy or silty, with some debris visible. There is a dark, round object on the bottom of the tank near the center. The lighting is dim, creating shadows and obscuring some details of the environment.