Creates water currents and dazzling underwater scenes. Creates bubbles in the aquarium when attached to an air pump (air pump is not included). Durable, washable and high temperature sintered. Increase oxygen levels, reduce CO2 and increase PH. It is an important instrument to successfully keep aquatic fish for breathing process Green resin, non-toxic, safe to use. Tips: The new resin may have some smell, please soak it in water for 2 days before put it into your fish tank
