So I have this 15g column set up on my desk at work, it's nice to have, very calming. Over the past few weeks I have been watching my snail population and seeing how they are growing. One sticks out the most however. He is easily and inch long in shell. I was under the impression they stayed very small, but this one is bigger then my neurite snail I have in another tank. Was my information wrong? Or do I just have something very cool?