In the video, a person is seen cleaning a fish tank. The person is using a brush to clean the glass walls of the tank. The fish in the tank are swimming around, and the person is making sure to clean all areas of the tank. The fish are of different sizes and colors, and they seem to be healthy and active. The person is wearing a black shirt and is standing in front of the tank. The tank is filled with water and has a filter on the side. The lighting in the room is bright, and the walls are white.