Most Anemones are sessile with a specialized foot used to anchor them in soft substrates or attach themselves to rocks and corals. Provide excellent water conditions, moderate to strong current, and intense lighting. Bits of shrimp or other meaty foods can be used to supplement their diet.

Tridacna Clams have become very popular among marine aquarists. The most distinguishing feature of clams is their large two-part shell and interior mantle. Most have intricately colored patterns in the mantle, making them attractive additions to the marine aquarium.

Found in nearly all marine environments, Crabs can range from less than an inch to over 12 inches in diameter. Crabs are scavengers of any type of edible matter they find, providing an invaluable "cleaner" function, consuming both undesirable algae and detritus while mixing the sand.

Sea Cucumbers are best kept in reef or invertebrate aquariums. Water quality must be maintained at the highest levels, and care must be taken with any water intakes/overflows to ensure that the Sea Cucumber cannot become attached.

Fan Worms are marine segmented worms that are sessile, attached to rocks or sand by their base. The plume of Fan Worms can measure up to 10" in diameter on some species. Fan Worms require excellent water quality. Fan Worms require supplemental feeding with infusoria or foods designed for filter-feeding invertebrates.

Found in most marine environments, Lobsters inhabit the sandy bottom or the crevasses of rocky formations. Generally these animals are nocturnal, feeding at night, but most adapt well to the aquarium lighting.

Scallops are filter feeders, requiring food designed for these types of invertebrates. They require a sandy substrate or a large rock formation to find comfortable spots to rest and feed. Specialized foods and great water quality are required to successfully maintain these organisms in the home aquarium.

Sea Slugs, sometimes called Nudibranchs, display vivid colors and an unusual body shape. Typically found in tropical reefs, their most notable characteristic is the pair of stalked rhinophores or horns at the head of the Slug.

Shrimp make interesting and colorful additions to an invertebrate or reef aquarium. Shrimp are scavengers that will eagerly accept small pieces of fish or shrimp in the home aquarium. Shrimp have a hard outer shell (carapace) that must be shed (molted) for the shrimp to grow.

Snails belong to one of the largest classes of organisms, with over 40,000 recognized species. While the shell itself is the primary means of protection, the snail's ability to adhere to a surface and its production of noxious compounds also discourages predators.

Sponges filter massive amounts of water every day, feeding on the microplankton. Many will develop calcium, silica or sponging structures to support their shape. Sponges need to be anchored in rockwork; they do not tolerate sandy anchoring substrates

Sea Stars characteristically have five arms extending from a central disk like a star. In the aquarium they can be fed small pieces of fish, placing the food near or even under the Sea Star. Serpent and Brittle Sea Stars are popular additions to reef aquariums that contain live sand as they constantly stir the bed and provide oxygen to beneficial bacteria.

Sea Urchins are approximately 2"-3" in diameter, with the spines extending possibly twice that distance. Care must be taken to prevent the Urchins from accidentally overturning rocks in the reef tank causing damage to themselves and other reef inhabitants such as live corals. Sea Urchins make great additions to marine aquariums, consuming undesirable algae and detritus within the tank.