Lol, lucky you...
Just FYI, a good majority of the time -and especially with bettas- there are things the LFS says that are wrong, like the "Betta's don't need a filter or heater! They love small spaces!" quote I hear so often here, where I live. Apparently it goes on at other places, and there are looooots of other stuff that is also incorrect. Not saying this is everywhere, but it just seems to happen so often that you just have to begin to take what they say with a grain of salt

But hopefully your petco/petsmarts are better.