The video shows a person using a vacuum to clean a fish tank. The person is seen sucking up the water in the tank, and then they proceed to clean the rocks and other objects in the tank. The fish in the tank can be seen swimming around as the person cleans the tank. The person is using a clear vacuum tube to suck up the water and debris in the tank. The fish tank appears to be well-maintained, with clean water and healthy-looking fish. The person is wearing gloves while cleaning the tank, and they seem to be taking care to avoid harming the fish. The video provides a close-up view of the cleaning process, allowing viewers to see the details of the tank and the cleaning process.