I assume this was a troll and that no harm was done. However, it did point out to me how much misinformation there is about blue-rings.
First, it is correct that the active toxin in Hapalochlaena species that have been studied to date is TTX. However, that includes only H. fasciata, H. maculosa and H. lunulata. There are probably another half dozen or so species out their that have not been described or studied. The assumption is that they have TTX. How much is open to speculation.
Second, there are absolutely no data to my knowledge that report a loss of toxicity in any blue-ring when it is kept in the aquarium. There have been suggestions that this happens with puffers, but it has not been reported in blue-rings. It is a topic that we are working on, but the the data are not yet in. Therefore, one should assume that any blue-ring contains a lethal dose of TTX.
Third, death from a blue-ring envenomation is due to the cessation of breathing. Ventilation is sometimes called for, but one would want to leave the heart along unless a health professional detects a problem.
Fourth, there is no currently approved anti-venom.
Fifth, if you plan on keeping a blue-ring, you should do what we do - notify local emergency responders and ER's that you have such an animal and that it possesses TTX. That way, if you are transported to an emergency facility, the medics will know what they are dealing with. In fact, every blue-ring tank in our lab has a warning label describing what it contains and how to deal with an emergency .
Roy