I cleaned off the GSP tonight, waiting on it to stop being ****** and come back out.
How's it start? I thought it is brown algae, not sure what will eat it either. I scraped some off the back wall of my tank tonight too, it's fine like hair and most of it is short. Gets on the glass daily too. Nitrates are zero during tonight's testing. I use RODI water from my spectra pure unit, that is new and RSCP salt, thinking about switching.