I was born in and have lived in Florida for over 50 years. I have talked to many individuals in the exotic animal, aquarium and tropical plant hobbies & businesses because these are also my interests, and here's the thing; It is very nearly irrelevent whether or not datnoids could establish themselves in south Florida. Southern Florida's ecosystem has been irreversably altered. A friend working for the state did a fish population survey in a S.FL. canal. Two ends of the canal were dammed and fish poison added (rotenone I think). The results were 35 species: ONE native, and this was 20 years ago. On land we have invasive tree/plants like Meleluca, Brazilian Pepper, Australian Pine as serious pests as well as new problems like Ficus microcarpa and Climbing Fern plus many other shrubs, trees, vines, ferns, etc. Animals like exotic Anoles, Cuban Tree Frogs, Iguanas, Monitor Lizards, Pythons, Marine (Cane) Toads, Gambian Pouched Rats (Grassy Key), Black Caiman, etc. Palm Vipers are supposed to have establised now around Miami. Other things that have been caught but not yet established (as far as I know): Esturine Crocodile (The "Salty"), Cobra including King Cobra, Boas, Prarie Dogs, and so fourth. One friend in Miami has seen a large arborial snake he could not identify, nearly 8' in length dark black but not reflective like the native and rare indigo snake. From some of the horror stories told by animal importers there is no telling what is loose, not to mention the zoo being damaged in Hurricane Andrew, and fish farms being flooded into canals. In the water: Oscars, Peacock Bass, Tilapia, Pacu, Walking Catfish, Snakehead, various Plecos (saw about 15, 1' specimens cleaning algae off a manatee in Blue Springs in Central FL), Rice Eels, several smaller Cichlids. Occasional finds include red-bellied piranha, silver arowana, red-tail catfish (Yikes!) etc, etc, etc. So whether any datnoid will live here is probably not a concern, it probably couldn't stand the competition!
If this thread was started to see if these fish should be banned. No.
If to see if they could be pond raised outdoors. Probably with suplimental heating or cover on the occasional near-freezing night.
If it to see if they could harm our eco-system. No, the horse has left the barn, it's a little late to close the doors.
It almost makes no since anymore to ban any fish that does not present a direct health hazard to humans and unless it it likely to migrate outside of S.FL.
South Florida will NEVER again be like it was 200 years ago, anyone who says it can is deluding themselves.

That said, it is illegal to release any fish into the wild and they look better in a tank where you can see them!
Did I mention we have Lionfish offshore now?
