ahh i dont grill the poor lfs people. i figure its my responsibility to know what i keep, and all that is entailed in their keeping. i love researching fish and learning their compatibility. now, if i hear someone being told something obviously wrong like "Sure, the pacu and oscar will work in a 45 gallon" ill butt in and give a little guidance-but in a polite way, and i dont take offense if they dont listen.. its their money.
i just kept my mouth shut and let her continue showing me the plants she had. i ended up buying some java moss. this was the owner i was dealing with too, not some employee.