Hermits do have their merits where it comes to cleaning rock/sand, but one that size would have me nervous with anything it can get a hold of.
Besides the snails Gina mentioned, Trochus snails are a great addition and can be added regardless of their tank mates. They have a unique ability to thwart attackers by 'twisting' their shell to shake off predators.
They also blend in fairly well so it'll keep the kids entertained if you tell them to find 'x' # you added. Plus they'll get to see them on the glass - watching their mouths, eyes and feelers (for lack of the proper word).
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