Like Noods said some do, some don't. More store managers than not are pushing to get the tanks removed from their stores but it's very VERY hard to do. Being a former merchandise supervisor over the department, it just takes too much time for the upkeep. Being over 3 highly consumable departments with only 2 part time associates... you just can't give the fish the proper care they deserve. Factor in the amount of money loss due to fish loss, stolen fish, mislabeled fish being rung up at the register and then the man hours to clean the tanks, provide customer service, TALK to the people (and speaking from experience, most of the customers shopping at walmart have absolutely NO idea what they're talking about)... it's just not a good investment to keep the tanks in the store. The only thing is does is drive sales of the fish hardware (tanks, filters, heaters etc).