So I've been dosing vinegar to battle the cyano and it seems to have worked as most of it had gone away by itself, I cleaned up the rest but now instead of the purple mats of cyano and GHA I have this weird golden brown crud. Not sure what it is, wishing I had a microscope to see the cell structure. I should mention that it comes back within a few hours of blowing it off the rock powerheads and corals.