Oooh, I had nerites once. A friend of mine caught some in Hawaii (I'm sure it was illegal and I admonished him for that) and gave me a dozen of them. I couldn't very well tell him to fly back to Hawaii and let these guys go so I plunked them into my tank. They were very cool but they had the nasty habit of crawling out of my tank. I found one a week or two after I first introduced them and it was totally stuck to the side of the tank, dry as can be. I know they're intertidal so I put it back in the tank and sure enough, it bubbled after a few minutes and out came the snail!
But alas, they all eventually crawled out of my tank to their demise.
