Next time you get your water tested at the LFS, ask for the specific results. "its fine" doesn't tell you much, for all you know, you could have sky high ammonia and they still may tell you "its fine".
Good idea, ask them the actual numbers and you can give it to us and we can tell you why it's fine! Or why it's not!
A couple of opinions is always better than one!
Nerite snails are really neat. I love them and think they are beautiful. You could get one!
As other people said, make sure you have a lid on tho!