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Sea anemones are a group of marine, predatory animals of the order Actiniaria. They are named after the anemone, a terrestrial flowering plant, because of the colourful appearance of many. Anemones are classified in the phylum Cnidaria, class Anthozoa, subclass Hexacorallia.

Zoanthids are very attractive colonial anemones. They can make a colorful addition to the hard surfaces of the reef aquarium. They come in all sorts of colors from browns and grays to bright orange, red, yellow, green, blue and many color morphs.

Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin,and armed with a single pair of chelae (claws).

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Scleractinia, also called stony corals or hard corals, are marine animals in the phylum Cnidaria that build themselves a hard skeleton.

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The octopus a soft-bodied, eight-armed mollusc of the order Octopoda. Like other cephalopods, the octopus is bilaterally symmetric with two eyes and a beak, with its mouth at the centre point of the arms. Nearly all octopuses are predatory; bottom-dwelling octopuses eat mainly crustaceans, polychaete worms, and other molluscs such as whelks and clams;

A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa. Polyps are approximately cylindrical in shape and elongated at the axis of the vase-shaped body. In solitary polyps, the aboral end is attached to the substrate by means of a disc-like holdfast called the pedal disc, while in colonies of polyps it is connected to other polyps, either directly or indirectly. The oral end contains the mouth, and is surrounded by a circlet of tentacles.

Sea slug is a common name for some marine invertebrates that more or less resemble terrestrial slugs. Most creatures known as sea slugs are actually snails, i.e. they are sea snails (marine gastropod molluscs) that over evolutionary time have seemingly lost their shells, due to having a greatly reduced or internal shell.

Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea. Starfish are marine invertebrates. They typically have a central disc and five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates.

Sea urchins or urchins, archaically called sea hedgehogs. The shell, or “test”, of sea urchins is round and spiny, typically from 3 to 10 cm (1.2 to 3.9 in) across. Common colors include black and dull shades of green, olive, brown, purple, blue, and red. Sea urchins move slowly, feeding primarily on algae. Sea otters, starfish, wolf eels, triggerfish, and other predators hunt and feed on sea urchins.

Shrimp are swimming crustaceans with long narrow muscular abdomens and long antennae. Unlike crabs and lobsters, shrimp have well developed pleopods (swimmerets) and slender walking legs; they are more adapted for swimming than walking.

Sponges are the basalmost clade of animals of the phylum Porifera. They are multicellular parazoan organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. Sponges have unspecialized cells that can transform into other types and that often migrate between the main cell layers and the mesohyl in the process. Sponges do not have nervous, digestive or circulatory systems. Instead, most rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove wastes.

Tube-dwelling anemones or ceriantharians look very similar to sea anemones but belong to an entirely different subclass of anthozoans. They are solitary, living buried in soft sediments. Tube anemones live inside and can withdraw into tubes, which are composed of a fibrous material made from secreted mucus and threads of nematocyst-like organelles known as ptychocysts.

Xenia is a genus of photosynthetic soft marine coral resembling a mushroom, with “arms” coming out from the top that end in many-fingered “hands”. It is unique among corals because of its ability to use its “hands” to “pulse” or push water away from the colony in a constant, grabbing motion. Common Names include: Xenia Elongata, Fast-Pulse Xenia, Xenia is sometimes referred to a Pulse Corals

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