The only thing that bugs me more than LFS employees who don't take proper care of their fish is the people who think yelling at them and calling them names is going to fix things. There are ways to handle those types of people, and immaturity is not one of those ways.
The best thing you can do is simply not shop there. Do not give them your money, because they will only use that money to harm more fish. If you really want to make a difference, ask to talk to the manager. Walk with the manager and point out your concerns in a polite manner. If talking to the manager in person is not your forte, then send them letters politely explaining your concerns. Parading around the store insulting people is not a way to make a difference.
The best thing you can do is simply not shop there. Do not give them your money, because they will only use that money to harm more fish. If you really want to make a difference, ask to talk to the manager. Walk with the manager and point out your concerns in a polite manner. If talking to the manager in person is not your forte, then send them letters politely explaining your concerns. Parading around the store insulting people is not a way to make a difference.