In the video, a person is seen using a vacuum cleaner to clean a fish tank. The person is holding the vacuum cleaner with one hand and using the other hand to move the vacuum cleaner around the tank. The fish tank is filled with water and has a green plant inside it. The person is wearing a white shirt and is standing in front of a sink. The vacuum cleaner has a clear plastic tube attached to it, which is being used to clean the tank. The person is moving the vacuum cleaner around the tank, presumably to clean the water and remove any debris.