How long have you had the anemone?
What type of anemone is it?
What size is the anemone?
Is there a clown hosting in it?
Is this a reef tank?
Check your bulbs for the writing on them and tell us what it says. Is there a special large size ballast with your lights, about the size of a brick?
Any idea how old the lighting is?
You may be over feeding and fouling your water, try only once or twice a week, and soak it in a vitamin suppliment like Selcon, Zoecon or Zoe.
Also try mysis shrimp, silversides, frozen krill, perhaps the Formula 1 or 2. I'm just not a fan of anything freeze dried for an anemone.