The Two Little Fishies NPX Bioplastics are pelletized biodegradable polymers that provide a time-released source of food for bacteria that assimilate nitrate and phosphate.
Nitrates are the result of the breakdown of fish food and the resulting waste. These bioplastics release organic food which promotes the development of bacteria and this bacteria then removes the nitrates and phosphate as well as acting as a food source for filter-feeding invertebrates.
Caution: Maintain sufficient water flow through NPX Bioplastics to prevent the production of hydrogen sulfide gas. Employ strong water circulation, aeration, and/or a surface skimming overflow in the aquarium to maintain high levels of oxygen saturation. The use of NPX Bioplastics in marine aquariums must be accompanied by the use of a protein skimmer to achieve the export of bacteria and assimilated nutrients. It is not necessary for the outlet of the filter containing pellets to be positioned near the intake of a protein skimmer, but it is necessary to have a protein skimmer running on the system.