Quietly Produce Small and Dense BubblesThis aquarium bubble stone can quietly produce very dense clouds of small bubbles. When the bubbles in the water burst, the noise will decrease. Many small bubbles are generated in the aquarium, and the material is transparent nano-acrylic, which, together with the bubbles, will produce a dazzling curtain effect. Double Oxygen Dissolution RateIdeal for adding oxygen to your hydroponic system. Increases oxygen levels, reduces carbon dioxide, and raises pH. Easy to UseUsing the suction cup, the air stone is firmly adsorbed on the water tank. Durable and suitable for home, office, aquarium, fish tank and hydroponics. AdjustableIf you need a very dense cloud of small bubbles, please adjust the air pump manually. The amount of air in this nano aquarium can be adjusted via a regulating valve. Buy 1 get 3 free accessoriesThis beautiful aquarium stone kit includes a nano disc, a 35mm air disc, a regulating valve and 2 suction cups. The height is about 3cm. Note: The data are all manually measured, please allow an error of 1-3cm. Due to differences in light and display, there may be some color difference, please refer to the actual item received.