by Robert Bullard

Created on: February 24, 2009   Last Updated: March 28, 2009

Starfish are truly unique and exotic creatures, and the addition of these animals can introduce a new dimension to your aquarium landscape. Although they seem hardy, they are in fact very delicate. So if you choose to add one, it's best to research the basics.

You should have a tank that is well developed and stabilized (this includes a healthy coral system, proper amounts of microbes and algae, as well as a proper pH balance); this can take up to six months to accomplish. If the tank isn't properly set up, your starfish won't stand a chance. Even after they comfortably settle in, they're still very sensitive to sudden changes in Ph, Oxygen and salinity levels so be careful. You should also be aware that most starfish cannot tolerate copper-based medications (which might be used to treat other fish in your tank).

In this article you will learn of a few species that are perfect for the aquarium environment, as well as a few which are detrimental.

The Linckia species is by far the most popular species for the aquarium. They come in many colors, from bright orange and blue, to deep red and purple. These creatures generally grow to no larger than 12 inches in diameter, and typically have five arms (but some can have six). These animals graze algae off of rock surfaces and other available substrates. Usually (in an aquarium setting), they will refuse most attempts at artificial feeding; however they have been known to eat food tablets when very hungry.

The Sand Sifting Sea Star is a plain, but beneficial species. Aquarists love this animal because it tends to root around in the sand and other substrates consuming great quantities of detritus and uneaten fish food. This animal is nocturnal, and will grow to about 11 inches across as an adult. Be wary if you have any pufferfish in your aquarium, they are the major predator of this peaceful animal.

The Fromia is another popular species among reef tank enthusiasts. From the marbled appearance of the Fromia Sea Star, to the tiny size of the Red Bali Star - these gentle creatures will glide across live rock and coral, searching for detritus and micro-organisms to eat. These tend to be solitary animals, but as long as the tank is big enough, they should be fine with other Sea Stars.

The Harlequin Serpent Star is definitely a Sea Star to consider adding. With its long, skinny, banded legs, it moves like a spider throughout your reef system. These scavengers grow to about six inches across; and while typically nocturnal, will come out in the daytime if hungry. They are quite happy as long as there are hiding places and plenty of room to roam about.

Basket Stars and Feather Starfish are excellent ways to add depth and motion to your reef tank. They are basically plant-like in appearance, but as the Basket Star resembles the plant, the Feather Star resembles the root. However, they are nocturnal hiding within the reef by day, and extending their remarkable arms by night. They need these arms because they are filter feeders, stretching out their arms to filter plankton from the water currents.

Now there are certain starfish that you should avoid if you have a reef aquarium. Among these are the Bahama Starfish, the Chocolate Chip Star, and the African Red Knob Star. These species are NOT reef safe, because they feed on coral polyps; as well as clams, sponges, invertebrates, and even other starfish.

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