NEED HELP STAT!

I have this algae that I have been trying to fight for a few months. I have tried to do the lights out for 3 days and all of my parameters are almost dead on with acception of my calcium thats at 450. I am running carbon and my phosophates are at 0.0.
Now the algea is starting to grow on my corals and is starting to break off and float around the tank. I need help and hope that anyone here could help me identify this kind of algae. I am running radion pros that come on at 1 pm and turn off ...