Non-toxic and eco-friendly materials:Made from quality resin and plastic, durable, non-toxic and pollution-free, safe for your fish; Absolutely safe for the fish you love. Great -looking ornament and really fun to watch when put together. Real underwater movement directions: the air hose with decorations on the valve adjustment or pump connections. Put in the aquarium decorations and fixed position. Adjust the air pressure to make decorations to get your ideal motion effects. Requires air pump (not included) and 3/16" tubing (not included). then you can adjust the frequency in which the lid opens. Chest sink to the bottom, the ‘chains’ divers attached to the chest suspended in the water, with oxygenation, divers in the water floating swing, such as the chest should strive to explore the way; When the diver floats the trunk treasure will open and close to reveal the treasure inside, more vivid and active Ideal for various aquariums and safe for both fresh and salt water, your
