Mine never touched it. Maybe they had too many other choices.That is a minor reason that I like Panda Garra as they are one of the few fish that will chow down on the stuff. I have never seen this myself but they are reported to do so. Oddly I've never had any BBA.
Don't go out and get Panda Garras to solve. You don't get fish to cure an issue. You get fish because you like, not to cure issues.
From what I've read they will eat BBA but not as a first choice. They would rather eat the green stuff and bio film. They also need protein.Mine never touched it. Maybe they had too many other choices.