How long has the tank been running for? Anemones are well known for being rather touchy. They shouldn't really be added unless the tank is well established and has been running for about a year. They are slow reproducers and, due to the latest "nemo" craze, are in danger of getting even rarer on their native reefs. Clown fish don't actually need anemone as alot of people think, they will bond with pretty much anything put into the tank. Maybe something to think about, alot cheaper and alot less likely to die on you.