The video shows a clear plastic tube filled with water and sand. The tube is placed in the bottom of an aquarium, and the sand is being poured into the tube from above. The aquarium is decorated with rocks and plants, and there are several fish swimming around. The water in the tube is clear, and the sand is a light beige color. The fish are of different sizes and colors, including yellow and blue. The tube is positioned in the center of the aquarium, and the sand is being poured from above, filling the tube up.