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yeah they are cool, but like what Nancy said, a nautilus is no picnec and not good for beginners. I heard that they last longer though... hmm,(scratches chin)
But they also are not nearly as interesting, unless you're in this for research. They need to have a very deep tank with almost no light, plus tempatures higher then like, 60 something will kill them. So Beware!
So my point is that taking care of these animals wil drive you crazy, and best avoid it unless you wanna end up looking like this.