RE: Algae Attack!
Have you made any recent changes to the supplements, salt, or foods you are using? Those are usually the source of phosphates that will trigger an algae bloom.
Another possibility is the die-off of some critter(s). Also check to make sure your skimmer is working properly. If you have not torn it down and cleaned the eductor and pump with vinegar in a while it would be a good idea to do so now. I did that to mine last week and its amazing how much better it's working now.
Gary
125 SPS, 75 gal. LPS/softie reef, 9 gal. Nano