Glowlight tetras are a naturally occurring species of fish. The only genetically modified fish offered for sale currently is the GloFish, which is a genetically modified zebra danio.
winnydapoo, those tetras you listed should all make good tankmates for a dwarf gourami. How many gouramis do you plan on having? Most dwarf gouramis are males due to hormone injections, so territoriality is an issue. I wouldn't get more than two, and even then I would try to create distinct territories with plants. The tetras should be in a group of at least six.