Versatile, easy-to-use and highly effective filter media that transforms harmful, toxic ammonia from fish waste into healthy, beneficial nitrates which release nitrogen to feed aquatic plants; Outer layers of dead and decaying bacteria are shed and continuously replaced with new blooms of thriving, ammonia hungry bacteria; Protected spaces within the media serve as incubators, supporting continuous production of new bacteria within the colony; Bio Comb Fluidized Bio Media is low maintenance and self-cleaning; Bio Comb Fluidized Bio Media is designed to provide the best possible habitat for both young and mature beneficial bacteria colonies