Running three nutrient export systems could be fighting each other.
Pellets being a carbon source will remove both no3 and po4. Along with gfo you could starve your macro cause it to deteriorate adding back to the system. Though I have no experience with pellets I believe to much to fast strips the water to quick.
I would pick one or the other for nutrient export either macro and gfo or carbon
If you choose to go the Biopellets Route. Consider this
I run prodibio a form of carbon dosing. While I also ran gfo I was never happy with tank. I was cleaning tank more than I would have liked. I stopped running gfo. One week after stopping gfo. I had a algae bloom I cleaned it all up and from there on after the system balanced out and I have no nutrients. I clean my glass weekly. I also filled my reactor with hydroton since I no longer use gfo.
Just so you know I run a sps and clam garden
Good luck
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