Organic filter medium for fluidized bed reactors for effective biological nitrate and phosphate reduction with a quick-starting, continuous action. Tropic Marin® NP-Bacto-Pellets consist of a mixture of natural bio-polymers, which promote the settlement and growth of nitrate and phosphate degrading bacteria and other microorganisms. These nutrients are then available as valuable biomass and food sources for filter feeders.

Low concentrations of nitrate and phosphate, as in nature, allow for bright and vibrant colors with very good growth and excellent vitality of the corals. The nutrient concentrations must be controlled to create these naturalistic conditions in the aquarium.