Coralife ACLAF791 1-Inch Mini Bio-Ball, Treats 45 - 60 Gallon Aquariums, Box of 225
Coralife (Energy Savers) bio-balls enable aquarists to maintain large biological loads in much smaller filter areas. The dramatic increase in surface area is achieved by the unique, geometric design of the smaller. Available in mini size. Comes with 1-inch and 1-gallon capacity of bio-balls. Its contain 225-piece per color box.