I went to my favorite pet store and their bettas were terrible! Almost all of them had this white stuff over them that looked like they were shedding (like snakes). It was terrible. I told the manager (my mom's friend who is super nice) and she put them in the back room to be treated. She was so mad that the other employees put them in water that was a totally different temperature (apparently that is how they developed that nasty...fungus?....Ick?).
I'm disappointed in them, but as long as she treats them like she says she's going to. I wish all pet stores could be like that (treating part, not getting them sick).