I have a dual reactor,gfo in one and carbon in the other. I stopped the gfo last week after 1) phosphate hit zero and 2) treated tank for red cyno. I will be doing all my tests tomorrow. My refugium, not big, but packed with cheto and I take out a pint or more weekly. Will post results tomorrow.Your NO3 and PO4 are out of wack , you need Brightewells NeoNitro and There BioFuel, they work in sinc to get both levels to .05. Do you have Bio Bead reactor ?