The Air Track creates a colorful column of bubbles in your aquarium with endless color combinations using 12 color-changing RGB LEDs. A round 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 rate, and keep your fish still lively and alive. The air bubble is not generated. It needs to be used with the air pump (the air pump is not included), ideal for fish tank, fish tank, etc. Create exciting aquarium landscapes and improve aquarium aeration with a shimmering air bubble curtain with eye-catching LED light effects. The 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 that you wash it with tap water and put on water from the tank for 1 to 2 hours.