I curently have three hermies living with me. I have had them for about 3yrs or so. Well anyway, I haven't had any problems with them molting or anything. I just see them change shells every so often. I have a sponge in there along with a water bowl and food bowl. I have to give the hermies a bath every week so some sort of gills that they have stay moist. I'm sure it says that somewhere on a website. Also make sure you have a big tank for them to stay in. I used to have a pretty small one but I could tell they didn't like it so I bought them a big tank and now they are pretty happy.

Good Luck on Getting Your Hermies!!

ps- I bought my hermies at a petstore and they don't seem to be less healthy than any other that I've seen. You might also be able to find some wild ones. I know I've found some before. But those are salt water hermies and take alot more care plus they are meant to be in the wild.