Two Little Fishies NPX Bioplastics 400mL Seawater Reference Solution it may be an indication

it may be an indication that NO3 is being removed too aggressively

KH/Alkalinity

which provides airlift for silent operation

In a sense

The sinking loops remain stable for a very long time

Two Little Fishies NPX Bioplastics 400mL Seawater Reference Solution it may be an indicationNitrate and Phosphate Reducing Biodegradable Polymer Pellets. Two Little Fishies NPX Bioplastics is a pelletized filter media made from biodegradable polymers. For use in a fluidized filter or media reactor. The slow release of organic food from these plastics promotes the development of bacteria that assimilate nitrate and phosphate. These bacteria can be harvested by protein skimmers, so that the nitrate and phosphate levels are naturally reduced.