Good thread, gives me an idea for a new one.
A couple things, first since I've gotten hooked (pun intended) into the hobby I've noticed a big difference between "ideal" and reasonable business. If I were to post a thread saying I had 10 Oscars in a 20G tank.... whew! But, the LFSs have to do that to be viable. Granted they use large filtration systems, massive water changes, etc. But it goes to show the difference between the hobby and business.
Also, Walmart has outsourced their fish care. I forget the name of the company, but if you see a problem in one of the stores, mention it to management and they should be able to contact their Rep.