Can anyone I'd this algae? Last time I asked I got GHA but now it's looking different and it's spreading faster. I think what caused it was phosphates leaching from live rock I got. Tank is only two months old and the phosphates are 30ppb (Hanna phosphorous) and I have GFO absorbing them. Nitrates are 0 with a salifert kit... the algae does not come off the rock when I tried to siphion it out. Also powder blue tang will not eat it.
