I haven't kept nerites in a while, but I was thinking about something I was doing a while back.
If you keep them really acidic (or is it just the softness snail guys?) water, their shells can erode after a while, ultimately killing them. I had some reef putty laying around, so I mixed some of the epoxy, pulled one out, patched him up and plopped him back in. It worked! I did it to some others, and while it wasn't pretty, it did the trick. I even fashioned some little putty horns to turn one into a horned nerite. They need further treatment after a while, but you can keep them alive indefinitely that way. Some were more putty than shell! Darth Vader as a snail.
