What type of algae is this? It is rough feeling and difficult to get off the rock. Never gets long and stringy like GHA. What can I do to curb it? I treated it with revive a few months ago and almost eliminated it. But my corals really didn't react well to the treatment so I stopped it. I was thinking a tuxedo urchin? Dr tims? Phosphates I keep around .05 to .08 and nitrates between 8 to 16 ppm. Tank is about 8 months old but rock came from an established tank.


