We can ship most small angels and tangs in this bag. As you can see it doesn't pay for you to only ship one fish in a box. You are going to be charged for the weight anyway so you might as well use it. Due to the Cube Rate factor we can add 2 small fish with no or very little extra charge to us. We pass the savings on to you by letting you add extra fish without charging you extra.
Most companies do.
Also beware when you see automatic calculated shipping on a shopping cart.