I would say they are probably still getting used to their new home. Over the years ive found mine go through phases. Sometimes they will be active, sometimes they wont, sometimes they will be into climbing, sometimes digging (not to moult, but just for fun).
I kept my two hermies in a large Kritter Keeper for several years before they moved to a ten gallon which they were in for about 5 years and are now in a 20g

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The water I have always provided for mine is deionised (bought at a supermarket) and I keep the sand about 4inches thick at one end, two inches at the other so they have a nice moulting spot. Barney has moulted more times than I can remember but haerskly less so. I just think it depends on the crab. Barney is also very tame and always has been whereas even after all this time Haerskly still panicks quite a bit with human contact.
I dont actually use any kind of heating for them and never have done, though I always make sure that it never gets too cold. (I live in the UK)
Ive always fed mine household food. They get dog food, apples, brown bread, gamon steak, grapes, banana, fish flakes, rice... most things!
If you google Vanessa Pike Russell you should find her site. She was an excellent friend whenever I started out. She and some others even sent me out supplies I couldnt get a hold of from the US and Au. for no cost. They were a god send. You should check out the hermies yahoo group too. Its been going for donkeys years now so it has pretty much every concievable question going on it already answered