It's surprising how much lfs DON'T know!! One of mine sold me a gourami instead of a dwarf flag.. It annoyed me, but I like my gourami.
Neither petstores, one is a chain - very flash - know anything. They have their "fish experts" which know less about fish than I do. Most of which I've learnt on here and from reading endless info on the net.
I ask them questions which I need an answer to and just get "I don't know". I come on here and 6 people answer it for me. They don't even know how to sex platties for gods sake. I mean. It's pretty simple. I went for a job at both pet stores and neither accepted me, which broke my heart. If I went their, I'd be their star fish person, I could answer everyone's questions.
It sucks that you have to have something in paper to say you can do the job when the majority on this forum would know more than anyone with a piece of paper.
Well, that's my opinion on lfs's. They're great, but there's a lot they don't know.