Well I've had friends to the little 10 gallon Eclipse setups. The anonome is not neccessary at all....but it would be a really cool addition to a small tank with a clown as long as you have optimum lighting.
Later!
I would suggest a soft toadstool leather coral before an anemone. My clowns love it. It take less lighting than the anemone . When my tank crashed, my clowns went several months w/o any...they were fine then too.
My clown actually stays in about two gallons worth of a 72 gallon tank! As long as it isn't to small for what you want,and you don't over stock it , IMO it would be fine.