I think that too many people are considering their CUC what can be purchased from a store in a package. Am I right? Worms and shrimp can be considered part of a CUC because they clean up leftover food. nassarius snails will devour any left over meaty foods, shrimp eat almost everything. many stars arent cleaners, except to deplete the worms and pods found in your sandbed. Hermits and snails do great as clean up and anyone who disagrees should remove them from their system and notice the difference.