Micro algae is a sign of a normal healthy aquarium. Too much can become an unsightly scene, however, if not kept in check. These snails and crabs have diets that are based on algae consumption. They move across the glass, rocks, and substrate in a constant search of an algae meal. Scarlet Hermit Crabs have bright red legs with gold marking on their face. They don't disturb other reef inhabitants and have a relatively long life span. The Zebra Hermit Crabs are typically a little smaller than the Scarlets. Their markings are white and black and have similar behaviors as the Scarlets. Margarita Snails are constantly on the move in search of algae. Their black to mother-of-pearl shell is very attractive in the reef setting. Information about the 30 gallon packageInformation about the 55 gallon packageInformation about the 75 gallon packageInformation about the 90 gallon package Information about the 120 gallon package Information about the 180 gallon package