Can anyone help me ID this stuff? It's only growing on the tops of the highest rocks. I removed it and it came back in 7-10 days. Nitrates and Phosphates are both at 0 and I feed 3 times a day so I'm assuming whatever this is, is probably just consuming it? I have been adding copepods and phytoplankton for a couple months with zero improvement. Using socks and added a skimmer 3 weeks ago for filtration, no refugium yet. Tank is 1 year old. I'm getting set up to dose h202 in an effort to get rid of uronema (DNA tested positive twice but no outbreak in fish). Whatever this is seemed to thrive when I was dosing Metronidazole but hasn't gone away now that I'm not dosing anymore. Any help appreciated.