Two Little Fishies Bactiv8® NPX contains cultured naturally occurring marine heterotrophic microbes that aid biological filtration in marine aquariums. Use Bactiv8 NPX to enhance nitrification and denitrification, and to promote the decomposition of organic waste in heavily stocked aquariums. Bactiv8 NPX also rapidly establishes the biological assimilation and export of nitrate and phosphate when used with Two Little Fishies NPX Bioplastics® and protein skimming.