The video shows a fish tank with a variety of decorations and a heater. The tank is filled with water and has a glass wall. The decorations include a brown rock, a small plant, and a terracotta pot. The heater is placed on the side of the tank and is turned on, indicating that the water temperature is being maintained. The water in the tank is clear, and there are no fish or other aquatic creatures visible. The lighting in the room is dim, and the focus is on the fish tank.