I never go in cocky at LFS. I know that I can always learn something new everyday. I have the priviledge of going to some very reputable stores. That being said, I do find myself biting my lip sometimes when go to stores like Petsmart and Petco. When I overhear customers asking if a Pacu will live in a 30gal and the employee says, "Yes!" I really want to intervene. I usually wait until the customer is alone until I give my advice. In general, I tend to share experiences and practices with the LFS that I frequent. It's one of the best ways to expand my knowledge in this hobby. You can never know too much!