I know it's really frustrating to see these sorts of practices at pet stores. I had my own infuriating experience when I went into a Petland Discounts that was selling marine fish in rather dismal conditions (though nowhere near as bad as this store apparently). I thought I could help them out, since it was clear that no one there was too knowledgeable about marine fish, by taking up a temporary summer job there. In the one month I was there, what I saw initially was only the tip of the iceberg. Crocea clams under a single 40w growlux fluorescent bulb, heavily oxidized coins and other metal objects in the main saltwater filter sump, porcupine fish housed with reef lobsters, shark eggs, cyanobacteria covered "live rock" being sold for $7.99/ lb, and seahorses and mandarins that obviously were not eating or living off of only brine shrimp. Just to name a few of the things. The problem is that if you have a hardheaded manager who won't listen to others' input, there's not much even an employee can do to change things. I had an incident, which eventually led to my gettingn fired, where I got really fed up and tried to drip-acclimate some long-nosed butterflyfish instead of letting the manager just float the bags as he usually does. I can tell you myself that it's all very frustrating, and when I left, I wrote a letter to the vice-president of the company about these things, which wasn't answered.
Rant aside, I've been racking my brain to figure out how these sorts of practices can be stopped. As individuals, probably the most we can do is personally boycott those businesses and spread the word. But, I would hope that that's enough to at least make others here reconsider buying from those places, even in the name of convenience and saving a few bucks, to support more ethical places. I think that we can spot these problematic places, but it's sad that they'll still make a profit selling marine livestock by suckering in other people who are complete novices and spreading misinformation in the name of making a sale.