This is my second round with biopellets and it almost feels as if these new smaller pellets carry a bigger punch.
They're more effective but side effects seems to be more noticable too (to me)
They pretty much eliminated any trace of stuff (nitrite, nitrate, etc.) but they also seemed to create more CO2 (or course) in the process.
On the old set up I ran the skimmer with a CO2 scruber so that may have helped as well.
On the new set up I just have an air pump going through the CO2 scrubber. Haven't run it long enough to see where pH ends up with long term.