Anchorstone Sand Airstones anchor in the substrate with clear plastic pieces, eliminating the need for suction cups. Compressed sand construction provides even air distribution.
Instructions Attach the Anchor Stone to the airline tubing of your air pump. Be sure that the pump is turned off. Place the airstone in the aquarium. Cover the plastic Anchor with gravel to keep the airstone from floating. Turn on the pump. To regulate the airflow use an aquarium air valve or gang valve.