Never had any luck with it working on BBA. I either have a super strain of it or.... It works well on GSA and hair, but BBA? Not in my experience. I called API and talked to a rep there and he told me it wasn't effective on it. YMMV
I've even overdosed it once by going past the recommended 3 day regimen. Don't do that. I nuked several of my crawling plants of which none survived. Had that not happened I could say confidently that everything in the tank lived through even the OD and looked healthy.