Description: Do you need aquarium bubble stones to add oxygen to hydroponic growth system? The purpose of the air stone is to gradually diffuse air into the aquarium and provide oxygen for fish to breathe. Our aquarium air stones are medium in size and will produce a large number of small, stable air bubbles without leaking, supplementing your fish with enough oxygen and making the aquarium more beautiful. Function Rising bubbles improve ventilation and movement of the aquarium, versatile aquarium lines for decorative and functional air bubbles. Good quality Made of quality material , can make your aquarium tank more efficient in pumping oxygen. Long service life Can clean with repeated use, long working time. Provides fine and constant aeration to your tropical aquarium. Excellent performance Need to use with air pump and trachea, good performance (air pump and trachea not included). It is an important instrument for successfully keeping aquatic fish for the breathing process. Wide Application The length is 30cm/11.8inch. Perfect for your aquarium or fish tank, and it is the best partner for the air pump. How to use: 1. Please soak in water 15 minutes before using this product. 2. In long-term use, if dirt is blocked, you can clean for repeated use when the bubble decreases. 3. Can be used with air pumps 6W and above. (The higher the watts of the air pump, the better the gas output effect).