Well, its less traumatizing to the fish than injecting them with color...which they do to glassfish...which escapes back out of them slowly but surely, you know- if they dont die first. They have a very short life span due to this.
Because this seems to be a novelty on the rise, Im all for better treatment of the fish.
I still think its odd, I mean, this makes fish more interesting to have? Theres pretty fish out there, just more work..boy are some people lazy!