I have actually bought a dyed fish before. It was a Parrot Cichlid dyed blue just like the ones of the pic. He was the only one in the tank, so I thought I'd take him home. A few months later he slowly turned orange. I still have him today, and he is about... 4 inches. There is normally no sign of an orange color when they are dyed at this size or age, until the mature then they lose the dyed color. Purple, red, blue, green, no matter what color it is, they always go back to orange.