Realistic Underwater Volcano - Note: Air pump and air tube not included. This volcano decor comes with an air bubble stone. When connected to an air pump, a lot of bubbles will erupt from the summit, creating the coolest underwater landscape in your fish tank. Air Bubble Stone Included - The aquarium decor includes an air bubble stone with a standard 3/16" diameter nozzle. It can be connected to a standard tube to create smooth bubbles, increasing oxygen for your aquatic creatures. Durable and Safe - The hand-painted volcano, made of eco-friendly resin, measures 8 x 5.5 cm / 3.2 x 2.2 inches. It is flexible, realistic, vivid, and safe for your aquarium creatures. Versatile Use - This decor is suitable for aquariums, fish tanks, and house rockery landscaping. It fits mini, medium, and large aquarium tanks, enhancing any aquatic environment. Exotic Air Bubbler - By connecting the air bubble stone With air tube（air tube no included）,turning on the air pump, you can create an amazing bubble erupting effect in your fish tank, increasing oxygen levels and adding a captivating visual element to your aquarium. Aquarium Volcano with Air Bubble Stone - Realistic Fish Tank Volcano Ornament， Perfect to Betta Fish Tank and Aquarium Landscape Decor