The video shows a person's hand holding a blue object, which is then placed into a fish tank. The tank is filled with various types of coral and rocks, creating a vibrant underwater scene. The person's hand is visible in the frame, and the blue object is placed near the bottom of the tank. The coral and rocks come in different shapes and colors, including purple, green, and brown. The water in the tank is clear, and the lighting highlights the colors of the coral and rocks.