Bobby, this is a point where you and I disagree (it's what keeps the conversations interesting, eh?). That many hermits for that size of a tank is way to many. I usually recommend only 1 per 10 gallons. (I have personally removed mine from thereef and fed them to the mantis). They are going to starve in there.... well, they will after they eat all your snails. A hungry hermit is a dangerous one.
Aside from starving, make sure you put a lot of bigger empty shells in there of different shapes.