I realize that this horse is about as dead as it will ever get, and this has probably been posted before, but everyone should check out glofish.com. They talk about the testing the did to ensure that the fish had no advantage over regular zebra danios. They also give you the information about the research papers published.
If you are concerned about them, I recommend at least looking it over.
If you are concerned about them, I recommend at least looking it over.
