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Interesting thread everyone. I agree mostly that hermits are not that useful. I have about 15 blue legs in my 120G, but they are all at least a year old, as I won't be buying new ones. They only seem to hlep keep some detritus off the rocks. Red scarlets are agressive like the blue legs and seem to concentrate on small patches of algae for me, they are great, but I only have 3 of them.

As for Good snails: Stomatella, Cerith for sand bed tanks and Trochus / Astrea snails are my favorite. All these snails multiply fast in my tank (especially the trochus and astrea). Always have lots of tiny guys growing up in the sump. Once they are bigger, I toss em up into the display tank.