It's just like other fish. Minimum tank size for a 6" nautilus 36x18x24, the same for what a 6" Aro should be or a 6" TSN, as it the nautilus grows the tank is "supposed to get bigger" just as when the Aro and TSN get bigger, the tank is "supposed to get bigger", filtration is the same for most fish, double the filtration or more because of heavy bio-load. So they basically have the same husbandry as other fish we keep, so some will die because of poor husbandry just as fish do.Yeah but the nautilus aint like other fish is it?
Other fish are at least easier to take care of but a nautilus will not survive for long in captivity
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They also need a chiller, just as in some fish do that members house here.
All this info is available on the net, just as in the fish we all have in our tanks.
If this animal goes mainstream, meaning available anywhere and cheap, just like most of our fish, some will die and die for all the same reasons as the fish in our tanks. It's just part of owning a fish in an aquarium.