I would have to say as for me I use both Reactors(GFO and carbon) with NO3PO4-X by red sea too. Past week to 4/24
NO3 = O ppm and PO4 is .08ppm Alk. 6-7dkh PH 7.67-8.1 Mg. 1260 CA. 425ppm
NO3 = O ppm and PO4 is .08ppm Alk. 6-7dkh PH 7.67-8.1 Mg. 1260 CA. 425ppm