Hello AD. Congrats on the new snails. So glad to hear they have survived their trip around the country. As long as your pH doesn't drop below 7.1 they should be ok. Once the pH drops below 7.0 the acidity of the water can do damage to the snail shell.
As mentioned above they need calcium to thrive. Feed them some zucchini every now and then (high in calcium) too you can place egg shells in the tank for additional calcium. You can place the egg shell in a mesh bag and replace them once they have dissolved.
Best of luck and hope you can share some photos sometime.
Snail diseases and problems
Ken

I've moved your thread to the "freshwater invertebrates/snails" section fo the forum.
Thanks!
Ken