Hello and thank you for your inquiry.
For a clean up crew it is a good idea to have a few different critters to help out, ones that will feed upon algae and ones that will help clean up excess food. I suggest a mixture of a few different types of snails (Astraea, Nassarius if you have a sand bed, and some Cerith snails). Along with them I will usually mix in a few hermit crabs (blue legged and scarlet). I also like to include either brittle or serpent starfish to help feed upon excess food.
If there is anything else we can do for you please let us know.
Marine Depot Customer Service