I have a dozen Astrea snails (they label them as Turbo in my LFS
) and a dozen dwarf blue legged hermits. After my cycle had completed one particular rock was totally covered in brown hair algae so I put the hermits on it right after acclimation. Within 2 days it was totally clean. The snails took a bit longer to get going but now they do a good job on the glass.
A lot of people have problems keeping snails and hermits together but I never see any conflicts with this combination. The hermits are really tiny compared to the snails, and I make sure there's always stuff to eat so that probably has something to do with it.