Anemones can be kept in a salt water aquarium provided excellent water conditions are maintained. they also require intense lighting and a strong current. They can be fed on blood worms, pieces of shrimp and other meaty scraps. These animals make great additions, and, depending on the species, are very beautiful. They can also form relationships with clownfish, which is amazing to watch. It could actually come to the point where you do not need to feed the anemone any food itself because your clown will bring food to it.
Although anemones are predators most of the species kept in fish tanks have a symbiotic algae (zooxanthellae) that will provide the anemone with nourishment as long as the lighting conditions are correct. if you place Tube anemones, Carpet or magnificent anemones in your fish tank ensure there is sufficient space between them as they will sting, and possibly kill, each other.
Some mobile species may also damage live coral and anemones may also eat other invertebrates such as crabs and urchins or smaller fish. Placement and choices of anemone is very important. While these animals may not be poisonous to you, they can however severely injure or kill inverts, fish, and coral. Please do your research before making a purchase. (I will try to compile a small list of the most popular store bought anemones and there compatibilities in the next couple weeks)