In the video, a fish is seen swimming in a tank. The fish has long, white fins that it uses to propel itself through the water. The tank is decorated with rocks and plants, creating a natural environment for the fish. The fish appears to be healthy and active, moving smoothly through the water. The lighting in the tank highlights the fish's scales and fins, making them stand out against the darker background. Overall, the video provides a peaceful and calming view of a fish in its habitat.