i complained when mine did. wrote a long e-mail, detailing what i'd seen, what was wrong, and how i had to rescue one betta who some kid plopped in another betta's cup. i must have looked odd, sitting on the floor with two betta cups in front of me, cussing up a storm and dipping my hands in the nasty water to scoop out a fish, but i did it. i would have bought the little guy, too, if i had the money. or, rather, i would have cussed out the manager and demanded him for free or discount.
the next day, the manager called me, apologizing his head off, and conditions improved for a while. a few weeks later, i went back, and things were just as bad, if not worse, and the little guys looked to be on death's doorstep. a week later, they hadn't gotten anymore in, and haven't since.