Every Walmart you go to you see over crowded fish tanks and sad looking Betas on a shelf with water that has been dyed blue.  I was horrified to see that they also sell Fiddler crabs the other day and that was the last straw for me.  The Fiddler crabs were in tiny containers with water.  They are not aquatic they live on the beach.  They need sand, salt water, companions, and a place to dig a cave.  They were not even given the basics to survive.  Walmart employees are not trained to take care of the fish or any other live animals they sell.