Although that 4-6 watt thing is true in a lot of cases, it is not always. My BTA tried to climb clear outa the tank before I got MH's. His foot was actually at the very surface of the water line.
Donahue, it seems to me that you would first want to know which kind of anemone that you want, before people could help with the care for one. And I would recommend reading a lot about them, and paying attention to the negative responses people have with them also. They are neat, but for some they are not worth the maintenance. Lighting, water quality, feeding, they move around and can sting and kill surrounding corals, they have an ironic adoration to powerheads! And if you get it all right, they go and split on you and take over the tank!! LOL