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any algae thrive on nutrients and light. you can lower light or nutrients or both. for lights, i think you can use bulbs - i.e. color temp - that are more conducive to corals but less usable by algae. for nutriets, you gotta filtrate/skim out or just control feeding.....
It sounds like "cyano" to me. I agree with NJ_ychung1 controlling food and not overfeeding helps, also check your phosphates. You might choose to use a commercial algaecide from the LFS, but this only kills it temporarily. Also make sure you have a good cleaning crew that includes a gobie or blenny to help sift the sand.
If worst comes to worse you might want to darken your tank for a couple of days, depending on what corals you have.
I have a feeling that i have been feeding way to much. i am gonna cut down on my lights too. my halides come on at 0930 and of at 2030. My actinic's go on at 0715 and off at 2230. any input on my light cycle would be appreciated.
As the tank matures, outbreaks should be smaller and less frequent but never go away completely, if all your paramiters are good increased flow was a good suggestion, when it does start up in a area, just blow it off with a turkey blaster. I do not worry about the stuff floating around, it was was growing that area because it liked it there, and other areas may not be as well suited to it. Your skimmer will clean it up.
GregH