Purple/red turf algae

[Reefer Rob]

Fought with that stuff for years. Urchins will keep it mowed down to some extent. I finally beat it with a combination of reduced nutrient input, macro algae in my refugium, and aggressive use of GFO. Over the span of about 2 weeks it turned white and died, along with the Chaeto in my fuge. I have a red Gracilaria that took over in my fuge, and seems to like the low nutrient level in my system.