Non-Toxic Environmentally Friendly Material: Made of high quality resin and plastic, durable, non-toxic, non-polluting, safe for your fish; absolutely safe for your favorite fish. Beautiful decorations that are really fun to watch together. Real direction of movement under water: valve adjustment or pump connection with decorated air hose. Put on the aquarium decorations and fix the position. Adjust the air pressure to create decorations for the ideal motion effect. Requires air pump (not included) and 3/16" tubing (not included). You can then adjust how often the lid opens. The chest sinks to the bottom and the diver is suspended in the water from the “chain” attached to the chest. With oxygenation, the diver floats and sways in the water.Those who love the chest should try to find a way out; as the diver floats, the treasure chest opens and closes, revealing the treasure inside is more alive and alive Perfect for all types of aquariums, safe for the environment freshwater and
