Originally Posted by dinotrex
What do they eat?
Anything and everything for the most part. As long as there are fish in the tank being fed, the hermits will get fed one way or the other.
Make sure what you are seeing is not simpley a molt. The shedded exoskelaton can look remarkabley like the original. If you know how many you are supposed to have, do a "head count". Hermits will also fight with each other for valuable realestate (including killing snails) so be sure you have plenty of empty shells.
Other than that, how where they acclimated and how's the water specs?