Couldn't see the picture- not a member there and don't want to join just to see a picture; nonetheless, I get the gist from the forum thread.
A "magic" susbstance that lets fresh and marine water fish live together. I don't see anything terribly wrong with that to be honest- except for the question in my mind "how many fish did they kill before they got it right?"
I am of course, assuming this isn't all a giant hoax. (which is a strong possibility).
I had the same dilemna with Glofish- I wasn't going to get any- but my wife loved them and they are so widespread me buying a couple to join my golden danios and zebra danios is not going to exaccerbate people geneticly modifying fish. (they do brighten the tank up though). How many Danios were killed trying to make them?
I saw comments on that about it being wrong to mix fish from different ecosystems:
although, people mix asian, african, american, river, lake and stream fish together all the time- and I don't think anyone complains about that!!!!
I'm interested to see how it works on inverts. Would this allow you to breed nerites and amanos in a "freshwater" tank? How much will this stuff cost? Many questions.