The air track creates a colorful column of bubbles in your aquarium with endless color combinations thanks to color-changing RGB LEDs. A round disc-shaped disc shape for oxygen supply can stay stable at the bottom of your tank, and produce more small air bubbles which would add dissolved oxygen level, and still keep your fish lively and alive. The air bubble does not generate. It must be used with the air pump (the air pump is not included), ideal for aquarium, aquarium, etc. Create exciting aquarium landscapes and enhance aquarium ventilation with a shimmering air bubble curtain with eye-catching LED light effects. Air bubble stone is made of non-toxic mineral material, with high temperature sintering, safe, durable, washable. It is safe to use in your aquarium. For the first use, we recommend you to wash it with tap water and put it on with water from the tank for 1 to 2 hours.