Nutri fix np is a bio media and bacterial food source adapted specifically for the reduction of nitrate and phosphate in aquariar what is nutri fix np xr nutri fix np x is a bio media and bacterial food source adapted specifically for the reduction of nitrate and phosphate in aquariar how does it workr unlike indiscriminate and potentially risky carbon dosing regimens such as vodka which entail adding carbon sources directly to the main aquarium to promote bacterial spread and nutrient uptak