6 Mini Brittle stars, 6 Cerith snails, 6 Nassarius snails, 1 Tiger tail cucumber, 6 Bristle worms. The Detritus Warrior Package will be on your side in the battle against detritus build-up! All of these critters will find leftover food, fish poop, and any other dirt lying around and vacuum it up. One package is a good start for a tank of approximately 50 gallons.