Yeah they usually have a *very* good return/exchange policy on freshwater fish. PetCo and Petsmart both do, if I remember, though its been awhile since I worked at PetCo people would bring their "deceased" fish back all the time. 9/10 times though it was from fault of their own... but there were a few times when it was maybe... stress from transport or change of climate. Did they *just* get the shipment in? That's when we had most of our fish returned dead would be after we got a truck in. If they settle in our tank for a few days then they were usually fine.