Oh, God.
As a biotope purist who likes to try to create as accurate as possible a recreation of a little slice of an actual natural habitat, I stay away from even varieties selectively bred to have subtly more distinct coloration than wild stocks, let alone albinos, golds, longfins, etc, so I have a real problem with hybrid monstrosities like parrotfish, flowerhorns, etc, and then to inject dye into them just turns my stomach.
There are so many beautiful and interesting species of natural fish out there, more than any one aquarist could keep in a lifetime, so I really don't understand why people have to breed monstrosities and then mutilate them.