I know not all pet store employees/owners are bad, and some, but very few know a thing or two about reptiles.
But most dont. Simply put, i dont trust them, and I think that before large chains like petco and petsmart hire 'specialists' in reptiles or fish, or any other animals for that matter, should take a test on them. Not some little 10 minute "are turtles cold blooded?" type test, but something harder.
A 17 year old shouldnt have to correct a 30+ year old "reptile specialist" in petco that a 20 gallon tank and fluval 2 filter for an adult yellow bellied slider is not going to be the last upgrade that the girl (customer) is ever going to buy, or a diet of reptomin (pellets) alone is not adequate and that the turtle he is selling the young girl is not a male, but a female..that just aint right
I've been to a few 'okay' pet stores, most of them specialzed in reptiles, knew a ton about snakes, but kind of lacked the common sense that you shouldnt keep a soft shell turtle with a Red eared slider, but hey, they did keep all their turtles with UVB lighting, offered them the correct food, eh I guess somethings are just too good to be true around here..
..all the petcos and petsmarts i've been too, well..I just feel like slapping the dummys who work there, especially when some guy brings a tied up iguana that he caught in his backyard in a small shoe box and shows it to the pet supermarket employees and all they do is laugh and one of them goes "yeah man i had like 7 of those things, they dont live long, mine died in like a year"
In the end, toss out the idea that not all pet store employees are bad and dont go to ANY of them for help if you have just got a new animal. Join a forum and ask people who have been keeping them for longer than you, that or ask a vet, do internet research, or read some books.
ptcake, you got lucky, and I am glad you did..