HI
Apparently there is one guy in Germany who had success in breeding them, I don't know the name or any other details. Just heard that he was successful. He has a group of 5 or 6 in a 2000+ gal tank, cooled to 20 Degrees Celsius, even the juveniles only eat live shrimps. All these informations came from the guy who build the tank, no guarantee that these infos are correct.
These guys die at higher temperatures, one public aquarium in Germany has killed a few because they have the money for buying expensive fishes but no money for a decent chiller.....:uzi:.
Like the Nautilus and some other critters this is an animal that can be kept under very special conditions but should not be attempted by the normal hobbyist. There is a reason for having a Red List for species that are not allowed to be traded.
Best wishes
Jens