Also, a lot of people are absolutely off their rockers and just bounce around the shop screaming about how awesome every animal they see is. Then they ask for an Oscar or a gar and one of those "plastic fish tank thingies". When you explain to them that the fish can't live in that little tank, they only gain partial comprehension of what that means and proceed to make more poor choices right away. The best thing to do about customers like that (and it's still sad) is to get them revved up about bettas or other small fish that do okay in smaller tanks (usually easy to do since the kind of people we're talking about tend to subscribe to anything the wind blows their way) and let them choose a betta for a medium-sized critter keeper. Then, once they've chosen their betta, keep talking to them while you walk to the counter. They will follow you as you push dechlorinator and a heater and filter into their hands. End the conversation at the checkout stand when the cashier starts scanning their items and you''re done with them for awhile.