I was at my LFS yesterday and picked up two new snails. The guy working there told me they were nerite snails and that I they could be transitioned from the saltwater thank they were in to the freshwater tank I was planning on putting them in to. I added a small amount of fresh water to container I was keeping them in and then repeated this process 20 minutes later. After putting them in to my tank they have yet to move. I have three questions and would greatly appreciate any kind of help in finding an answer to this. A) Am I freaking out over nothing and they're just adjusting to their new home? B) Did I kill them by trying to adjust them to fresh water C) Are they even Nerite snails? Thank you for your time and help with this.