I have been running biopellets on two of my tanks with completely opposite results. lol
The 125g it had zero effect on, helped with the phosphates a tad but but that was it. That reactor was running for about 5 months before i took it down the other day.
The 60g has seen not a marked decrease in trates but they are not rising as quickly as they used to. Also helping with phosphates in this tank as well.
So to me, the jury is still out or not if it's a good system. lol Oh, and also, you need different containers for the biopellets I believe, you dont use the ones with the sponges and you have to run pellets in their own reactor. Alot of places will say not to run gfo
while running pellets in the beginning anyway.
If it were me I would run gfo
and carbon in the dual reactor and if you want to add pellets get another reactor just for that.