Well, I am going to go ahead and knock on wood and say it, but it appears like the blackout did the majority of the trick ridding the tank of the small cyano outbreak we had.
We didn't realize how much cyano was covering the back glass until the night before we started the black out. I used a scraper with a handle and scraped the cyano off the glass as my wife siphoned it up. Then she did the majority of the rocks and sandbed where the cyano was thick.
We turned the lights on 3 days after we started and it was amazing how clear and clean the tank looked. Corals looked happy but it definitely took them a little time to come back out and re-adjust to the light.
Infact, I have read that some hobbyists do a blackout periodically just to get the tank looking that clean and knocking out any minor algae issues. I might start doing that once every six months or so.
FTS to be posted soon.