Ideal Replacement Bubblers: Driven by nano air pumps, these tiny air stones are compatible with all classic, tube, flow, halo and life aquariums of Biorb and Biube. Model: HS-55; Tiny Size: 1.4" L x 0.4" D; Inlet Diameter: 1/4"; Color: white. Perfectly match the original tubing in your target tanks. Require a 3/16" connector & a 3/16" hose for extra use. Medium Bubbles: Produce a good amount of dense bubbles around the cylinder. A great way to increase oxygen solubility in your aquarium and enliven the aquatic lives. Reliable Material: Made of mineral material and built solidly, it causes no effect to the health of your aquatics. Help keep your fish or roots growing healthily. Easy to Use: Soak the bubblers completely in water for 1 hour before use. It’s necessary to replace them once they get clogged after weeks or months of usage. These compact air stone cylinders fit perfectly with various fish tanks of Biorb and Biube. Great replacement for the bubblers becoming blocked by dirt or deposits that prevents air from getting through properly.