1.in nylon bag
2.in net back
3.in color box
filter ball/bio ball with ceramic rings inside/aquarium accessory
Bio ball provide the ideal surface area and mix of air and water.they promote gas exchange. Increase oxygen level and help cultivate nitrifying bacteria. These balls are safe for use in fresh and saltwater aquarium and will not clog up with organic materials.they are also totally inert and non leaching.
bio ball with ceramic rings inside can be used as a mechanical prefilter medium for coarse particles or as a biological filter medium. As prefilter medium, protects the biological filter material from rapid silting.