Most experts in Cephalopods don't recommend Nautilus for home aquaria. They need COLD water... 18-20c, and bright lights will blind them. A LED 'nightlight' really, is all you would want. They're pretty sedentary, most of their swimming is vertical, so they need a tall tank. They're not terribly exciting to watch, very sensitive to poor water conditions... just not something that'd be at home in a typical home aquarium.
All that aside, I think they're some of the coolest critters in the sea.
I used to see them around from time to time, but don't see them as much anymore. Always wanted to try keeping them, but the extra high tank, cold water requirements always scared me off.
I've long had a thing for Cephalopods. Done tons of research on them, been a member of tonmo.com for decades. Never have made the leap. Octopus are the easiest, but with their short lifespans... well, I'm not sure they really belong in captivity. Nautilus would be great, they can live a long time, but the rather odd requirements always stopped me. Cuttlefish, if they were more easily available in the US, I would probably have tried by now. I seriously considered doing cuttles in my current tank for a while, it'd be ideal... but I like my reef too. Oh well. Someday.
