ultimatemj
Active member
Interesting "details" at the end of the link Marine Depot posted:
The emphasis is mine
Biopellets are often marketed as a nitrate and phosphate reducer, but that's only partially true. There are different organisms that will feed on nitrate versus the ones that feed on phosphates. Biopellets tend toward the reduction of nitrates by boosting the organisms that feed on them. Phosphates will naturally reduce by a certain amount in relationship to the reduction of nitrates. That is somewhere around a 16:1 ratio, whereby a reduction of 16 parts of nitrate will see a reduction of 1 part of phosphate.
With biopellet systems, we're reducing nitrates at a level faster than we can reduce phosphates. Nitrates will often become undetectable when using solid carbon dosing such as what we are accomplishing with biopellets. The remaining phosphates, then, become food for cyanobacteria if it is not skimmed from the water column.
It is imperative that the hobbyist remove phosphates from the system at a level that matches that of the nitrate reduction. This can be accomplished via water changes, but it's certainly not the most effective or simple method. While biopellets can replace the need to run GFO in a system, GFO is a considerably more effective phosphate reducer. However, by over-skimming (or boosting effective skimming via the direction of reactor outflow to skimmer intake), many hobbyists have found it unnecessary to continue the use of GFO in a system with biopellets.
The emphasis is mine