actually miles, anemones have a much better survival rate in captivity if you have a host clownfish for them, as the clown cleans and even feeds the anemones. if you want to keep an anomone (other than a condy) i would strongly reccommend gettting a host clown for it, however you can keep clowns without havign to keep an anemone...
miles is right that anomones do need intense lighting as they derive most of the energy from the products of their zooxanthellae, but also benefit from target feedign of meaty foods, such as krill or other raw shrimp...what are the specs on your tank, i.e, size, lighting, inhabitants, etc..if you can post this info we can hlep you to better determine wether your ready for an anemone or not!
good luck
jon