In the video, a person is holding a black object in their hand. The object appears to be a filter or some kind of mechanical device. The person is moving the object around, possibly to show different angles or to demonstrate its functionality. In the background, there is a fish tank with fish swimming around. The fish tank is well-lit and has a variety of colorful fish swimming in it. The person's hand is steady, and they seem to be focused on the object they are holding. The video does not contain any other significant actions or events.