I concur with Fishmanic, but will say it a bit stronger. Responsible aquarists should not purchase any modified fish, no matter how it was achieved. With all the destruction to natural habitats and fish species becoming extinct, our efforts should be to preserve the natural species. After all, they are better to begin with, in terms of their biological aspects. Like all such practices, once you allow one there is no end. "Glofish" are prohibited within the UK and EU, and rightly so.