Also I would not worry to much about feeding the anemone. I may feed mine once every 3 weeks just as a treat. Your anemone will get most of it's nourishment from your lighting. Also it will grab what is floating around in the tank. My anemone has tripled in size since I got it 4 months ago. Couple questions.
What type of lighting do you have?
Also does the clown host the anemone?
If the clown hangs out in the anemone, chances are it will feed it.
If you want to feed it, take a small piece of whitefish, or shrimp, and feed it by hand. Thats what I have done to ensure that it gets it. Dont worry, be Happy!