Aquarium Decoration Kits: This kit is used in combination with an air oxygen pump (Air pump included) to create a "volcano eruption" effect, giving you a charming visual perception while increasing the oxygen level in the aquarium..High Quality Materials: the hand-painted live volcano is made of resin, which is safe, non-toxic, environmentally friendly and completely harmless to your fish. Volcano size: 10.5cm (diameter) * 7cm (height)..Increase The Oxygen: Air-Stone can dissolve more air in water and provide oxygen to the fish when Air-Stone is connected to an air pump (included)..Excellent Design: The disc shape can be stabilized at the bottom of the water tank, IP68 waterproof, excellent sealing design, can be fully immersed in water. However, the power supply unit is not waterproof. Keep away from water and water vapor..Easy to Use: Install the bubble lamp under the volcano stone and connect the air pump and the bubble Light. If you have any problem, please feel free to contact us. We will do our best to solve it. Thanks.