The video shows a person's hand placing rocks into a fish tank. The fish tank is filled with sand and has a computer monitor in the background. The person carefully places each rock into the tank, arranging them to create a natural look. The rocks vary in size and shape, and the person takes care to ensure that they are placed in a way that will not obstruct the view of the fish or the lighting in the tank. The person's movements are deliberate and precise, indicating that they are experienced in setting up fish tanks. The overall atmosphere of the video is calm and focused, with the sound of the water in the tank providing a soothing background.