One question? How mature is your tank?
Lighting and feeding is so very important with Anemo's but maturity of your tank is way more important to house an anemo. I see so many people wanting one and I understand why, don't get me wrong, some are pretty, they go great with some clown fish.
My suggestion to you is keep and eye on your PH, if it flucuates a great deal it can cause major stress to them. As your tank matures your PH will become more stable and as long as your not over stocked with either coral or fish your weekly water changes and maintenance should provide the trace elements needed.
I hope all works out for you And hope your anemo start feeling better.