The Marina Air Stone Is Ideal For Adding Accents In Any Aquarium The Air Stone Diffuses Air *-* Creating Water Movement. The Air Stone Also Increases Surface Agitation *-* Accelerates Oxygen Replenishment And Helps Release Carbon Dioxide Build-Up. *-* *-* simply Connect The Air Stone To Your Airline Tubing And Place It In The Desired Location. Rectangular Shape. *-* *-* size : 15 Cm (6 In) Diameter.

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