Nope, fluconazole didn't work. It eventually came back, some folks said its turf algae... no idea. Recently debated acquiring some fuzzy chiton's to battle it, but have yet to do so.
Been dealing with it too. Few months ago it all but disappeared. I was raising my magnesium but in doing so I killed my large Kenya coral and every type of pod I had and I had thousands that where breeding!!!! Then suddenly it came back with a vengeance in a few days. I’m almost at the point of thking my zoas and few other things out of my tank and placying them in another tank and completely starting over after doing a massive cleaning. Every few days to a week I’m pulling it out and sometimes by the hand fulls!!!!! And no that’s not an exaggeration. Good luck. I did find by lowering salinity it starts to skiff and float free