I've been doing some research. They seem to list them as "blood parrot fish" with an extremely intense coloration of red. I wonder if this color is dyed?
This is unfair to the fish! What about if the people who done this are dyed in various colours? Will this people enjoy to go to town in various "attactive" colours? Stop buying a dyed fish guys.
As far as I am aware, they are indeed done by acid dip (and the mortality rate is ridiculous). It's too difficult to inject and create that kind of color.