Gumby

I'm currently in the process of a 4 day blackout to kill BGA and Staghorn algae. I also have a lot of BBA showing up on the gravel and I was wondering if anyone thought that the blackout would kill the BBA as well? I've cranked up the CO2 as high as it can go without over running my reactor (AM1000 with Mag350 pump) and the BBA only seems to be getting worse.

If not, how about dosing Excel? I've got a 125 gallon tank so it would require a lot of Excel, but that's not a problem because I have access to a 6 gallon bucket of the stuff. Here's my only quarrel with using Excel: will it kill my shrimp? I've got Amano shrimp, Cherries, and Red Nose. I heard from a friend that higher doses of Excel are dangerous to shrimp. Anyone tried this out or know if it's true?