Finest Filters 10 pack of Compatible Air Stones for Biorb Biube Aquariums and Fish Tanks You are purchasing a pack of 10 high quality Compatible Air Stones suitable for use with all biorb and biube aquariums. PLEASE NOTE: These are not original brand air stones. They are a Finest-Filters compatible product intended to do the same purpose. Regular replacement of the air stone in your biorb aquarium is recommended, so that the air flow powering the filter is not reduced.