I work at Petsmart. A customer comes in an proceeds to explain to me that his fish tank that he purchased at our store had a crack in it. As usual he has no reciept. But I remember helping him buy the tank. I tell him no problem, bring the tank back and I will replace it with a new tank. Forty-five minutes later (the entire time he’s telling me needless details about the tank, and is blind to all my obvious attempts to leave to help the other 10 waiting customers staring at us) he leaves to pick up the tank from this house. Before going I tell him the following, “Check and make sure the crack is a REAL crack and not a loose string of aquarium sealant that has stuck to glass,…as that will often look like a small crack in the glass.”