Green Star Polyp.. GSP

The Sally Lightfoot Crab, Percnon gibbesi, is an excellent scavenger that will search the live rock and sand for food.

As proficient tank-cleaners, the Red Leg Hermit Crab is an essential member to any clean up crew and have no real drawback of keeping them in your tank.

The Pincushion Urchin has an oval to round body covered with hundreds of uniform spines. Its color can range from red to purple to white and blue.

Like most snails, the Turbo requires minimal care and is an excellent choice for any home aquarium. They are the most popular snail species in the entire aquarium trade.

The Blood Red Fire Shrimp, Lysmata debelius, gets its name from its deep, blood-red coloration along with its brilliant white spots across is carapace and appendages. It is without question one of the most vibrant and attractive invertebrate species available. It is a cleaner shrimp that will remove necrotic tissue and parasites from fish. They will often form symbiotic relationships with these fish as the stuff they clean off of them make for a tasty meal.

As nocturnal feeders, the Cerith Snail is one of the most popular snails for their algae-eating and sand-sifting ability.

The Banded Trochus Snail is touted by aquarists of all experience levels for numerous reasons. Like other members of the Trochidae family, the Banded Trochus is easy to care for and very adept at working as your aquarium's cleanup crew. T

The Mexican Turbo Snail, Turbo fluctuosus, native to the waters off the coast of Mexico, is an excellent algae-eater and beneficial tank member.

The Feather Duster is usually found in the coral rubble at the base of the reef aquarium, with some of the rubble being incorporated into its parchment-like tube. It needs to be housed in a well-established reef system as it is dependent upon plankton for its diet. It is very intolerant of copper-based medications.

The Sea Cucumber will feed mostly on algae and detritus through sifting the sand. As they are easy to care for they make an excellent beginner cucumber species.

• The Serpent Star will spend much of its time along live rockwork and will come out most often at night. They usually should not be housed with feather dusters as they can eat them.

Margarita Turbos require very little attention once introduced and need only be kept in a well-established reef tank with plenty of algae and live rock.