I had BBA in my 190 litre community tank.
I have heard a few horror stories about BBA so I trimmed all of the affected plants and everything looked very barren but good for a while but it came back with avengance.
I receintly used Flourish Excell at double the on label rate and after a week the BBA started turning a nice red colour, a week later it turned grey and a week after that I can no longer see it.
As a bonus the plants in my tank are looking better for using Flourish Excell as well.
I have heard that Siamese Algae Eater - Crossocheilus siamensis consume BBA so I have ordered one to help keep BBA out of my tank in the future.