From my experience, stopping the spread of BBA is the first step. Once it stops spreading, that is a good indication that your CO2 is at an optimal level. After that, the eradication is somewhat manual. You can spot treat with excel or manually remove the tufts of algae.
In the past, I leave the BBA intact in my tank. I monitor growth as I SLOWLY adjust my co2 level over a period of a few weeks. BBA will dissappear if your CO2 levels are good, but it takes a long time.
Here is a good thread concerning the use of excel to eradicate BBA.
http://www.plantedtank.net/forums/al...periences.html