Stop running gfo! Sps love high nutrients and high p04 especially. I have to dose neophos in my ato container if I don’t my acros start to lose color. And I don’t run any refugium, ats, gfo, Carbon, Carbon dosing and I don’t even run my skimmer anymore as my tank is just packed with acros. They are like sponges for nutrients. The more you have the less nutrient export you need.