The picture posted on reef central looks hairy where the stuff i have looks more like flat white/clear film.
I used a brush to clean the rock and did a 15% water change (RO/DI new cartridges) but it looks like its coming back. Whats driving me crazy is that its only on one rock.
Red Sea test kit reads
Nitrate 0.20 PPM
Phosphate 0.08 PPM
PH 8.38
CAL 450
ALK 9.2
MAG 1400