Biological Ceramic Rings – 500 Grams/17.63 Onces In Nylon Media Bag

Extremely porous ceramic media for efficient biological filtration. Hollow design effectively distributes water flow and allows massive colonies of beneficial bacteria to grow on and inside each ring. Great for both fresh and saltwater aquariums. Size of ceramic ring: 1/2 x 1/2 dimension of the media bag: 8. 0 x 5. 5.