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In my opinion Glofish, Guppies and Neon Tetras can live together but keep in mind, these are schooling fish, they like being kept in a group of 4-5 or so. You also have to pay attention to the Female to Male ratio so the females dont become too stressed. Provide enough decor and hiding spots in case they need them.
Unless you try to only get one gender of fish, esp with the guppies, they will most likely breed. The baby guppies with either need to be seperated or if your planning on leaving them in there, provide small plants for them to hide in.