Sea anemones are classified in the phylum Cnidaria and are named after the terrestrial flowering plant, because of the colorful appearance of many. Sea Anemones are found mostly in shallow waters with good water movement, collecting sun light. They have many tubular arms with stinging cells to capture and consume their prey. Care must be taken when handling anemones as some pack a powerful painful sting.
Anemones are sessile, with a sticky foot sac that is used to anchor them in soft substrates or attach themselves to rocks. They are fascinating creatures to watch and are a great addition to an established reef aquarium. As well, the popular bubble tip anemones, and many anemones form a symbiotic relationship with the various species of clownfish.
Most sea anemones are fairly hardy and easy to care for, but some can be quite difficult to keep. Anemones need an established saltwater tank with excellent water conditions, moderate to strong current and do well with a variety of lighting. However for the most vibrant display of their colors, try blue spectrum lighting or LED's; it really brings out their colors and makes them pop.
Keep the anemones in at least 30-35 gallon saltwater aquarium or reef tank. Anemones can grow up to 2 m or 6 ft in diameter and will do better in a large aquarium. A larger marine aquarium can give a better environment to the anemones and will help them grow healthy. Good ideas for food are chopped fish, mussels and or other quality frozen foods. They will also benefit from trace elements and iodine added to their reef tank.
Also, open water pumps in the aquarium can be dangerous for them as their tentacles can get easily caught in the pump and can even lead to their death. Similarly, a water heater can burn the tentacles of an anemone.