Check the listing for details. Fish Tank Bubble Stone Disc Oxygen Diffuser Kit Bubble Stone Bubble Diffuser. Color: Clear Red, Condition: New. Listed at 15.27 USD. 【Acrylic Construction】: Made from acrylic material in a compact size, aquarium air stone disc bubble stones diffuser kit is ideal for small tanks. 【High Dissolved Oxygen Diffuser Kit】: Fish Tank Bubbler operates effectively under low pressure, ensuring consistent misting and fine bubbles.