Dr. Tim's Aquatics Waste-Away Natural Aquarium Cleaner for Reef Aquariums
We have been using this for a couple weeks now. We didn't have a huge algae breakout but we have been using this along with GFO to get our phosphates down and that seems to be helping.
The first time I used waste away it worked in three doses. Wiped out what I think was a bad case of Diatoms. This last time I had to treat for 4 doses before I could see any change. This second time I also turned out my lights for 3 days. The combination worked for me. The algae seemed like the same Diatoms but I never tested the algae for confirmation.
I had cyanobacteria (blue-green algae) growing all in my tank, but this got the job done! : )