Good luck getting your clowns to host. Are they tank raised? Some people have printed out a picture of a pair of clowns hosting an anemone and taped it to the side of the tank. You have just as much chance having the clowns hosting your power head as them hosting the anemone especially if they were tank raised.
I fed my anemone small pieces of raw table shrimp. I cut the pieces so they were about half the size of it's mouth. This worked well until he got sucked up into my overflow.