AQUANEAT 4x2 inch Aquarium Air Stones 10pcs, Aerator Diffuser,Air Stones for Aquariums,Fish Tanks,Pond and HydroponicsBrand: AQUANEAT Color: Grey Features: Widely applicable: Suitable for hydroponic systems, ponds, aquarium fish tanks, helping extend the life of your nutrient solution, keep fish roots healthy and promote plant growth Air Stone Dimension: 2 "D x 4" H; Fits for 3 16 inch standard airline tubing Recommended a high output air pump at least 8W 10W or a commercial air pump Quality and safe materials: Made of safe, washable and non toxic material. Note: