Turbo snails are the workhorse of your clean up crew. They are great for cleaning nuicance algae, as well as day to day maintenance. They tend to leave macro algaes and plants alone. They are hardy and inexpensive, but will need to be added to or replaced over time. These snails will approximately the size of a dime to a nickel in circumference, and are shipped "damp", so don't worry if there isn't much water in the bag. Sold individually, or in lots.