In the video, a person is seen underwater in a fish tank, using their hand to clean the bottom of the tank. The person's hand is visible in the water, and they are using their fingers to remove debris and dirt from the tank's floor. The water is clear, and the bottom of the tank is covered in small rocks and gravel. There are also some plants and fish swimming around in the tank. The person's movements are slow and deliberate, ensuring that they do not disturb the fish or the plants too much. The lighting in the tank is bright, and the water is clean and well-maintained. Overall, the video provides a glimpse into the maintenance of a fish tank, highlighting the importance of keeping the environment clean and healthy for the fish.