I run all three plus Chaeto...

I notice that my PO4 goes up after a cheato harvest. I imagine it's because the cheato regrowing it taking up nitrates, and so my biopellets are no longer balanced. But i've not seen a need for GFO while running pellets, everything seems to stay nice and balanced, with even some extra nitrates that i'll bomb with vodka every once in awhile.

i run all 3 And when i started i told to run pellets first for a month than start the GFO.

I run all three . I started running GFO when I couldn't get rid of the hair algae. It did a good job at depleting it.

Chris