An easy, peaceful, reef compatible invert that is a great addition to your aquariums clean up crew. They help maintain a healthy aquarium environment by eating left over food on the sand bed, eating hair algae, and eating algae with cyanobacteria. When they get to a bigger size of about two inches, they may move around rock work or corals. They may need to upsize their shell, so to prevent them from killing a snail to take its shell, leave empty shells in the tank.