Suitable for All Kinds Fish Tanks landscapes, Whether natural wind or collocation with interesting animation characters. Astronauts float with the water, it can help you observe the water flow direction of the fish tank. Cute little astronauts aquarium decoration is made of safe and durable resin. It will not produce harmful substances and will not damage the environment of the fish tank, not easy to fade. Suitable for fresh water and salt water. Adjustable Position- The astronauts position of the diver can be adjusted according to the length of the fishing line. The floating ball can be opened. If you feel that the astronauts is floating too fast, you can add water appropriately.