Filter Aquarium Ceramic Media Ball Biological Fish Bag Bio Net Tank Porous New

Filter Aquarium Ceramic Media Ball Biological Fish Features: PH Neutral suitalbe for fresh water and sea water tank More than 10 times the ability to cultvate nitrifying bateria than normal bacteria house Wash it with aquarium water before use, do not use tap or boiled water Do not often change these rings. After six month used, change half of them and use new rings with the rest old rings Usage: Wash it first, then use it directly into the filter. Immediately you will achieve the nitrifying bacteria which is indispensible for your tank! Package included: 1 bag of Bio Ring