Fluval Biomax Bio Rings, Biological Filter Media for Aquariums, 17.63 oz., A1456
Brand: Fluval
Color: White
Biological filter media that provides superior filtration and beneficial bacteria growth
Complex porous design ensures optimal contact time as water passes through
Helps reduce and control ammonia and nitrate
Replenish only half the filter media at one time to allow proper seeding
Will not affect water characteristics