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PetSmart Top Fin Fine Bubble Aquarium Air Stone$3.99
This Top Fin Small Fine Bubble Air Stone produces clouds of micro-fine bubbles and maximizes oxygen levels in aquarium water. Ideal for protein skimmers for for dispersing CO2, this air stone suctions to the inside of your aquarium with a suction cup, and attaches to any standard airline tubing (not included). Only at PetSmart.