Bubblers definitely do help boost the humidity. Double dish bubblers: http://hermitcrabassociation.com/phpBB/ ... r#p1030806You can also add moss pits to help. You would use organic moss (as well as moss that is on the safe list), and moisten it with dechlorinated fresh water. Then, put the moss in a shower caddy or a glass vase laying on it's side so the hermits can walk in and out of it. Glass tops also help keep humidity in.